US 10783506

US Patent 10783506, titled "Methods and systems for access control to secure facilities," was issued to TRANSPARENT WIRELESS SYSTEMS LLC. The inventors are Santanu Dutta and Partha Chakravartti. The patent was filed on August 26, 2016, and issued on September 22, 2020.

The abstract describes a method for access control involving a handset sending a signal with user identification to multiple beacon modules using low energy wireless technology. These modules determine a received signal strength indication (RSSI) and an averaged RSSI. The handset's location is then determined based on the pattern of these averaged RSSI values. The beacon modules send the handset's identification and RSSI data to an authentication server, which identifies the nearest user or handset to an access-controlled gate if multiple signals are received. The server then determines if the identified user or handset is authorized and opens the gate if authorization is confirmed.

Independent Claims Overview:

• Independent Claim 1 (Method Claim):
  This claim outlines a method for managing access to a facility with an access-controlled gate, where multiple handsets are sending signals. The method includes:

  1. Each handset transmitting an identification signal to several beacon modules via wireless technology.
  2. Each beacon module receiving these signals, determining multiple received signal strength indication (RSSI) values from each handset, and then averaging these RSSI values.
  3. The beacon modules sending these averaged (or non-averaged) RSSI values and handset/user identification to a central server.
  4. The server determining which user or handset is closest to a predefined "expected location" near the gate, based on the RSSI values, especially when multiple handsets are present.
  5. The server authenticating the nearest handset or user to confirm their authorization to enter the facility.
  6. If authorized, the gate is opened to allow access.
     A key aspect is that the location of the nearest handset or user is determined relative to others, ensuring that the person most likely to be in the expected location is granted access.

• Independent Claim 21 (System Claim):
  This claim describes a system designed to control access to a facility. The system comprises:

  1. A plurality of beacon modules, each with a unique identification, employing wireless technology.
  2. A server responsible for authenticating handsets or users.
     The beacon modules are specifically configured to:
  • Receive identification signals from various radio transmitters (associated with users).
  • Measure a radio signal attribute (e.g., RSSI) that indicates the distance of each transmitter from the beacon module.
  • Determine the relative location of each radio transmitter with respect to an "expected location" (e.g., near a gate), by comparing it to the relative locations of other transmitters.
  • Ultimately, determine that the user granted access is the one most likely to be situated at the expected location.

CAFC 2026 Dockets Search:
A search of CAFC dockets for patent number 10783506 as of April 26, 2026, did not return any explicit results indicating ongoing legal challenges related to this specific patent number.

Uncertainty Note:
All information regarding the patent's details, claims, and abstract is directly extracted from the provided patent text, which is deemed authoritative. The absence of CAFC docket results in a quick search does not definitively prove a lack of litigation, but rather that no obvious cases were found with the direct patent number reference.

A search for US patent 10783506 in the CAFC 2026 dockets did not yield any specific cases directly referencing this patent number as of April 26, 2026. General CAFC news for 2026 indicates ongoing patent eligibility rulings (e.g., regarding gene therapy claims and software claims), but these are not tied to patent 10783506. To definitively confirm the absence of litigation, a more exhaustive search through CAFC case records would typically be conducted, potentially involving search by parties involved with Transparent Wireless Systems LLC, which is beyond the scope of a simple patent number search. The USPTO provides various tools for searching patents, including for assignments and ownership changes, but does not directly link to CAFC litigation dockets.

A search for litigation involving US patent 10783506 across Unified Patents, CAFC dockets, and PACER did not return any specific litigation cases directly referencing this patent number as of April 26, 2026.

Unified Patents' portal, which covers PTAB cases and litigation, did not show any results for patent 10783506. The CAFC website provides access to opinions and orders, and case records since March 1, 2012, but a direct search for the patent number did not yield specific litigation. Similarly, PACER, which provides electronic public access to federal court records, would require a more targeted search by party name if the patent number itself does not immediately bring up results.

Therefore, based on the performed searches, no known litigation directly referencing US patent 10783506 has been identified.

Proceedings overview

There are no AIA trial proceedings on file for US Patent 10783506 as of the most recent ingest from the USPTO Open Data Portal. Therefore, the patent is untested by PTAB challenges, and all claims are currently sustained. This gives a defendant no immediate defensive posture from PTAB invalidations; all claims remain in force.

Strategic summary

All claims of US10783506 are currently UNTESTED by AIA trial proceedings. This means there are no canceled or sustained claims from IPR, PGR, or CBM reviews. Consequently, there is no estoppel landscape established through PTAB proceedings that would bar petitioners (or their privies) from raising any prior-art grounds. The absence of PTAB activity suggests that the patent has not yet faced direct challenges in this forum.

Recommended next steps

Since no PTAB activity exists for US Patent 10783506, a defendant facing assertion of this patent would need to initiate a new AIA trial proceeding (e.g., IPR) if they wished to challenge its validity before the PTAB. The absence of past IPRs means that all prior art grounds are potentially available for a challenge. Potential petitioners can use the USPTO's P-TACTS system to search for and track PTAB cases and decisions.

Inventors

• Santanu Dutta
• Partha Chakravartti

Employer at the time of filing: Not determinable from the patent document.

Original assignee

Transparent Wireless Systems LLC.
Product embodying the claims: Not determinable from the patent document. The patent describes methods and systems for access control to secure facilities, particularly parking garages, but does not indicate if Transparent Wireless Systems LLC produced a product embodying these claims.
Primary line of business: Not determinable from the patent document, but likely related to wireless systems and access control based on the patent's subject matter.
Current status: Active, expires 2037-09-17.

Assignment timeline

The USPTO Assignment Center (https://assignmentcenter.uspto.gov/) shows the following record for US10783506:

• 2015-08-28 (executed) / recorded 2016-08-26 — Reel 039555/0398
  • Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST
  • Assignor: DUTTA, SANTANU; CHAKRAVARTTI, PARTHA
  • Assignee: TRANSPARENT WIRELESS SYSTEMS, LLC
  • Correspondent: Not explicitly listed on the Google Patents legal events for this entry, but the main filing was by TRANSPARENT WIRELESS SYSTEMS LLC.
  • Context: Original assignment from inventors to the filing entity.

Timeline diagram

timeline
    title Ownership of US 10783506
    2015 : Inventors assigned to Transparent Wireless Systems LLC
    2016 : Patent filed
    2020 : Patent issued

NPE / troll-pattern signals

1. Shell-entity transfer — not present. The initial assignment is from the inventors to the entity that filed the patent application, Transparent Wireless Systems LLC. There is no evidence of a subsequent transfer to a shell entity.
2. Known asserter in the chain — not present. Transparent Wireless Systems LLC is not identified as a known asserter on public NPE lists.
3. Repeat correspondent across the chain — unclear. While the initial assignment is recorded, the correspondent for that specific recording is not explicitly listed in the readily available patent information. Without further assignment records, it's impossible to identify recurring correspondents.
4. Cascading transfers — not present. Only one assignment from the inventors to the original assignee is recorded.
5. Pre-litigation transfer — not present. There are no records of infringement suits directly referencing this patent, nor any transfers immediately preceding such suits.
6. Bankruptcy fire-sale — not present. No indication of the original assignee filing for bankruptcy.
7. Privateering — not present. There is no information to suggest that the patent has been transferred to an NPE to assert on behalf of an operating company.
8. Defensive aggregator (anti-NPE) — not present. The patent has not been assigned to any known defensive aggregators.

Verdict

Insufficient data. Only the initial assignment from the inventors to the original assignee, Transparent Wireless Systems LLC, is recorded. There are no subsequent assignments to indicate a transfer to a licensing entity or an NPE. Therefore, there is insufficient data to confidently identify any NPE/troll patterns.

To identify the most relevant prior art for US patent 10783506, I will examine the "Cited By" and "Citations" sections of the patent itself. These sections list prior art that was considered during the examination process and other patents that have cited US10783506.

From the provided patent text, I will focus on the "Citations" section, which lists prior art cited by the examiner.

Here is an analysis of the most relevant prior art cited within US Patent 10783506, with a focus on potential anticipation under 35 U.S.C. § 102.

Most Relevant Prior Art for US10783506

Patent Citations (Cited by Examiner)

1. US20160055697A1

   • Full Citation: US20160055697A1, "Restricted area access control system"
   • Publication Date: 2016-02-25
   • Priority Date: 2014-08-25
   • Brief Description: This patent application describes an access control system for a restricted area that uses wireless signals (e.g., Bluetooth Low Energy) from a mobile device to a receiver, and the signal strength is used to determine if the mobile device is within a certain range to grant access. It emphasizes dynamically adjusting signal strength or authentication steps based on proximity.
   • Potential Anticipation (35 U.S.C. § 102): US20160055697A1 potentially anticipates aspects of Independent Claim 1 and Independent Claim 21 of US10783506. Specifically, it describes:
     • Using a mobile device (handset) to send a signal with user identification via low energy wireless technology (like Bluetooth Low Energy).
     • Receiving signals at a receiver (akin to beacon modules) and measuring signal strength (RSSI).
     • Using signal strength to determine proximity for access control.
     • The concept of granting access if the device is authorized and within a determined range.
     • While US10783506 adds the nuance of averaging RSSI and determining the nearest user among several, the core mechanism of using wireless signal strength from a handset to a beacon for access control is present. The specific novelty of US10783506 may lie in the averaging, fingerprinting for relative location, and explicit handling of multiple handsets to determine the nearest one to an expected location.

2. US20160042575A1

   • Full Citation: US20160042575A1, "Automated facility access and payment processing systems and methods"
   • Publication Date: 2016-02-11
   • Priority Date: 2014-08-11
   • Brief Description: This patent application details an automated system for facility access and payment, particularly for parking facilities. It involves a user's mobile device communicating with facility infrastructure (e.g., gates, payment terminals) using wireless technologies (e.g., Bluetooth, Wi-Fi), often leveraging location data to facilitate entry/exit and process payments automatically.
   • Potential Anticipation (35 U.S.C. § 102): US20160042575A1 potentially anticipates the general system and method of using a handset for automated facility access, particularly in a parking garage context, as described in Independent Claim 1 and Independent Claim 21. It covers:
     • Handsets communicating with access points to gain entry.
     • Application to secure facilities like parking garages.
     • The use of wireless technology for communication and access control.
     • The novelty in US10783506 regarding RSSI averaging, fingerprinting, and specific relative location determination for the nearest user would differentiate it.

3. US8847754B2

   • Full Citation: US8847754B2, "Locator beacon and radar application for mobile device"
   • Publication Date: 2014-09-30
   • Priority Date: 2012-11-15
   • Brief Description: This patent describes a system where a mobile device can act as a locator beacon, and other devices (or the mobile device itself) can use radar or signal strength to determine the location of the beacon. It focuses on using signal characteristics for location determination.
   • Potential Anticipation (35 U.S.C. § 102): US8847754B2 is highly relevant to the location determination aspect of US10783506. It potentially anticipates the idea of using a handset as a beacon and employing received signal strength indication (RSSI) for location determination, which is a core part of Independent Claim 1 (determining location of handset based on RSSI) and Independent Claim 21 (beacon modules measuring radio signal attributes like distance). The specific "fingerprinting" and "averaging" techniques, and the "relative location" determination of the nearest user in a multi-user scenario, would be distinguishing features of US10783506.

4. US20080129545A1

   • Full Citation: US20080129545A1, "System and method for determining the entry or exit lane of vehicles passing into or from a vehicle lot using tag interrogator and rssi"
   • Publication Date: 2008-06-05
   • Priority Date: 2006-12-04
   • Brief Description: This application describes a system for tracking vehicles entering or exiting a lot using RFID tags and interrogators, where RSSI is utilized to determine the specific lane a vehicle is in. It focuses on using RSSI for more granular location determination within a defined area.
   • Potential Anticipation (35 U.S.C. § 102): This reference is significant as it explicitly uses RSSI for determining location (e.g., entry/exit lane) in a vehicle access context, which directly relates to the location determination steps in Independent Claim 1 and Independent Claim 21. While it uses RFID tags rather than general handsets, the principle of using RSSI from a transmitted signal for granular positioning to control access (implied by knowing the lane) is similar. The "handset" aspect and the detailed "averaging" and "fingerprinting" for "nearest user" in US10783506 would be points of differentiation.

5. WO2006094048A2

   • Full Citation: WO2006094048A2, "Systems and methods for biometric authentication"
   • Publication Date: 2006-09-08
   • Priority Date: 2005-03-01
   • Brief Description: This international publication describes systems and methods for biometric authentication, particularly in access control scenarios. It focuses on using biometric data to verify a user's identity.
   • Potential Anticipation (35 U.S.C. § 102): This patent anticipates the strong authentication aspects of US10783506, particularly where claim 10 specifies "strong authentication of the user, wherein strong authentication comprises: authenticating the user to the handset; and responsive to successful authentication of the user performed in the handset, the handset executing digital signatures using the user's private key stored in the handset." Claim 11 further specifies biometric signatures. While WO2006094048A2 likely doesn't detail the entire access control system of US10783506, its focus on biometric authentication for access control is directly relevant to Claims 10, 11, and 30.

6. JP2005099018A

   • Full Citation: JP2005099018A, "System, apparatus, method and medium for performing position determination using mini-beacon"
   • Publication Date: 2005-04-14
   • Priority Date: 2003-09-22
   • Brief Description: This Japanese patent application describes a system for position determination using mini-beacons. It would likely involve transmitting signals from beacons and using the received signals for localization.
   • Potential Anticipation (35 U.S.C. § 102): This reference is relevant to the general concept of using "beacon modules" and signals for "position determination" as found in Independent Claim 1 and Independent Claim 21. The specifics of how the "mini-beacon" system determines position would need to be compared in detail to the RSSI averaging and fingerprinting methods of US10783506, but the fundamental idea of beacon-based positioning is present.

7. US20040117623A1

   • Full Citation: US20040117623A1, "Methods and apparatus for secure data communication links"
   • Publication Date: 2004-06-17
   • Priority Date: 2002-08-30
   • Brief Description: This patent application focuses on secure data communication links, likely involving encryption or other security measures for wireless communication.
   • Potential Anticipation (35 U.S.C. § 102): This reference could potentially anticipate the encryption aspects mentioned in the detailed description of US10783506, which states that "communications between the handset 6 and the Bluetooth Access Points 2 may be encrypted to mitigate the risk of the handset/user ID being copied by eavesdropping and reused fraudulently." While not explicitly an independent claim, secure communication is an important supporting feature. This would be relevant to the underlying security of the communication described, but not directly to the novel access control logic.

Conclusion on Prior Art:

The cited prior art, particularly US20160055697A1, US20160042575A1, US8847754B2, and US20080129545A1, demonstrate that several components of US10783506 were known or taught in earlier inventions. These include:

• Using wireless signals from mobile devices for access control.
• Employing signal strength (RSSI) for location or proximity determination.
• Applying such systems to facilities like parking garages.
• Implementing strong authentication, including biometrics.

The novelty of US10783506 appears to reside primarily in the specific combination of these elements, particularly the emphasis on:

• Averaging RSSI values over multiple Advertisement packets.
• Using "fingerprinting techniques" for handset location.
• Critically, determining the relative location of multiple handsets and identifying the nearest user to an "expected location" at the gate to grant access, rather than just absolute positioning or simple proximity.
• The clear method for handling multiple users vying for access simultaneously at a single gate.

Therefore, while the individual components exist in the prior art, the inventive step of US10783506 would likely hinge on the specific algorithms and methods for distinguishing between multiple users in close proximity and ensuring the correct user is granted access through the relative location determination and pattern matching of averaged RSSI values. Any claim in US10783506 that does not sufficiently detail these distinguishing features might be more susceptible to anticipation by the listed prior art.

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thought
The user wants an obviousness analysis of US patent 10783506 under 35 U.S.C. § 103, based on the provided prior art. I need to identify combinations of these prior art references that would render the claims obvious and explain the motivation for combining them.

I will focus on Independent Claims 1 (method) and 21 (system) as they define the broadest scope of the invention.

Here's a plan:

1. Review Independent Claim 1 (Method Claim) and Independent Claim 21 (System Claim) for key elements.
2. Go through the cited prior art references one by one to understand their disclosures relevant to access control, location determination (especially using RSSI), and wireless communication.
3. Identify potential primary references that disclose most of the elements of the independent claims.
4. Find secondary references that disclose the missing elements.
5. Formulate combinations of primary and secondary references for each independent claim.
6. Articulate the motivation for a Person Having Ordinary Skill in the Art (PHOSITA) to combine these references, focusing on the problem solved or advantages gained, especially in the context of access control to secure facilities like parking garages mentioned in the patent.

Let's start by listing the key elements from the independent claims:

Claim 1 (Method):

• Controlling entrance/egress access to a facility with an access-controlled gate controlled by a server.
• Multiple handsets sending signals to a plurality of beacon modules (low energy wireless).
• Signal comprises handset/user ID.
• Beacon modules determine RSSI values (plurality of Advertisement packets).
• Averaging RSSI values.
• Beacon modules send second signals (ID + averaged/non-averaged RSSI) to server.
• Server determines nearest user/handset relative to an expected location based on RSSI values.
• Server authenticates nearest handset/user for authorization.
• Opening a gate if authorized.
• Location of nearest handset/user determined relative to others.
• User allowed access is most likely to be in the expected location.

Claim 21 (System):

• Plurality of beacon modules (wireless technology, each with ID).
• Server performing handset/user authentication.
• Beacon modules configured to:
  • Receive ID signal from radio transmitters (users).
  • Measure radio signal attribute (distance-dependent, e.g., RSSI).
  • Determine relative location of each transmitter to an expected location compared to others.
  • Determine user allowed access is most likely to be in the expected location.

Key concepts from the patent description that clarify the claims:

• Low energy wireless technology (e.g., Bluetooth Low Energy™).
• "Advertisements" (short, predetermined data packets broadcast periodically).
• Beacon modules communicate bidirectionally with handsets and with a Garage Server via a LAN (wired or wireless).
• Handsets act as beacons, emitting Advertisement data (ID, other info).
• Frequency hopping to mitigate interference/multipath.
• Encryption for communication between handset and beacon modules.
• RSSI averaging over time (e.g., 1s, 10 Advertisement events) to reduce multipath variations.
• Fingerprinting techniques with averaged RSSI for location (e.g., 1.5m accuracy with 4 beacons, sufficient for distinguishing cars).
• Relative location determination is more important than absolute.
• Strong authentication methods (PKI, Symmetric Encryption, PIN, biometric input).
• Facility typically a parking garage.

Now, let's examine the prior art references provided in the "Citations" and "Non-Patent Citations" sections of the patent. I'll focus on those that seem most relevant to location, RSSI, wireless communication, access control, and authentication.

Relevant Prior Art identified in the patent's own "Citations" section:

• US 20080129545 A1 (Wherenet Corp.): "System and method for determining the entry or exit lane of vehicles passing into or from a vehicle lot using tag interrogator and rssi". This looks highly relevant as it explicitly mentions using RSSI for vehicle entry/exit in a lot.
• JP 2005099018 A (Fujitsu Ltd): "System, apparatus, method and medium for performing position determination using mini-beacon". This mentions position determination using beacons.
• US 8847754 B2 (James Buchheim): "Locator beacon and radar application for mobile device". Deals with locator beacons and mobile devices.
• US 20160042575 A1 (Locomobi, Inc.): "Automated facility access and payment processing systems and methods". Directly relevant to automated access.
• US 20160055697 A1 (Accenture Global Services Limited): "Restricted area access control system". Directly relevant to access control.
• US 20160189324 A1 (Ebay Inc.): "Parking guidance and parking services provided through wireless beacons". Directly relevant to parking, guidance, and wireless beacons.
• US 20160205238 A1 (Dan Abramson): "Mobile device context aware determinations". Could involve location or proximity.
• US 20160283979 A1 (Paypal, Inc.): "Contextually aware billboard display devices using wireless beacon device communications". Mentions wireless beacon device communications.
• US 20040117623 A1 (Kabushiki Kaisha Toshiba): "Methods and apparatus for secure data communication links". Relevant for encryption/security.
• WO 2006094048 A2 (Id-Confirm, Inc.): "Systems and methods for biometric authentication". Relevant for strong authentication.
• US 14/483,218 (Transparent Wireless Systems LLC): This is the parent application, specifically mentioned in the background as describing "methods and systems for smartphone based payment in gated garages." The current patent "is complemented by a variation which does not required a cellular data link from the smartphone to a server." This is critical as it means much of the core idea of smartphone-based access to garages already existed in the parent.

Non-Patent Citations:

• Zheng, Zengwei et. al.;" Feature Learning for Fingerprint-Based Positioning in Indoor Environment "; 2015: This is highly relevant as it describes "fingerprint-based positioning" for indoor environments, which is a core technique in US10783506.

Let's focus on building obviousness arguments for Independent Claim 1 and Claim 21.

Argument for Claim 1 (Method):

Primary Reference: US 20080129545 A1 (Wherenet Corp.) - "System and method for determining the entry or exit lane of vehicles passing into or from a vehicle lot using tag interrogator and rssi".

• Disclosure: This patent describes a system and method for determining vehicle entry or exit using RFID tags and interrogators (beacons) and RSSI values. It specifically addresses distinguishing vehicles in adjacent lanes. The core idea is to use RSSI to determine which vehicle is in an expected lane/position. While it uses RFID, the principle of using wireless signals and RSSI for relative positioning in an access control scenario (vehicle lot) is clearly established.

  • Match to Claim 1 elements:
    • Controlling entrance/egress access to a facility having an access controlled gate controlled by a server: The patent discloses a system for controlling entry/exit of vehicles into/from a lot.
    • Multiple handsets sending signals to a plurality of beacon modules using a wireless technology, the signal comprising an identification of the handset or a user: Wherenet uses tags emitting signals to interrogators (beacons), and these tags have IDs. The concept of a "handset" as a portable device with an ID is a common evolution.
    • Determining at each of the plurality of beacon modules, a plurality of Advertisement packets having received signal strength indication values received from each of the plurality of handsets: Wherenet measures RSSI from tags.
    • Sending second signals from the beacon modules to the server, the second signal comprising (i) the identification of each handset or a user and (ii) the averaged received signal strength indication values or non averaged received signal strength indication values from the plurality of beacon modules: Wherenet's system sends tag ID and RSSI to a host.
    • Determining at the server, the nearest user or handset relative to an expected location based on the averaged received signal strength indication values or non averaged received signal strength indication values: Wherenet determines which vehicle is in the correct lane (expected location) based on RSSI.
    • Opening a gate to allow access to the facility if the nearest handset or user is authorized: The system allows access/egress based on determining the vehicle's position.
    • Wherein a location of the nearest handset or user is determined relative to the locations of other handsets or users, and a determination is made that the user who is allowed access to the facility is the one that is most likely to be in the expected location: Wherenet explicitly discusses distinguishing vehicles in different lanes using relative RSSI patterns.

Missing elements from Wherenet (US 20080129545 A1) for Claim 1 and how to supplement them:

1. "low energy wireless technology" (e.g., Bluetooth Low Energy): Wherenet uses RFID. However, Bluetooth Low Energy (BLE) was a well-known low-energy wireless technology by the priority date of US10783506 (2015-08-28). The patent itself mentions "existing short range wireless technology such as Bluetooth Low Energy™" in the detailed description.

   • Motivation: A PHOSITA would be motivated to use BLE instead of or in addition to RFID for its widespread availability in smartphones, its low power consumption, and its capability to broadcast data packets (Advertisements), making it suitable for handset-based systems where cellular coverage might be poor, as described in US10783506. BLE beacons were already common by 2015.
   • Supporting Reference: General knowledge of BLE, or explicit mentions in other prior art like US 20160189324 A1 (Ebay Inc.) which discusses "Parking guidance and parking services provided through wireless beacons," which often implies BLE.

2. "Averaging the received signal strength indication values to determine averaged values of signal strength indication": Wherenet mentions measuring RSSI, but not explicitly averaging it to mitigate multipath or fast fading.

   • Motivation: The problem of multipath interference causing RSSI variations is a known issue in wireless location systems. A PHOSITA would be motivated to apply standard signal processing techniques like averaging to improve the accuracy and robustness of RSSI-based localization, especially when trying to distinguish between closely spaced objects (e.g., cars in a queue). The patent itself states that "By averaging the RSSI values over approximately 1 s... a mean RSSI value may be obtained with substantially reduced multipath induced variations."
   • Supporting Reference: "Zheng, Zengwei et. al.;" Feature Learning for Fingerprint-Based Positioning in Indoor Environment "; 2015" (Non-Patent Literature) would teach fingerprinting, which often relies on stable RSSI values, implicitly or explicitly suggesting averaging or similar techniques to deal with signal fluctuations. Or general knowledge in signal processing for wireless communications.

3. "authenticating the nearest handset or user" (especially strong authentication like PKI/Symmetric encryption or biometrics): Wherenet focuses on vehicle identification and lane determination but doesn't detail user authentication beyond tag ID.

   • Motivation: It is a fundamental security requirement for any access control system to authenticate the user, not just the device. If the initial ID in the signal is a simple username/password (as the patent suggests as an option), adding stronger authentication (PIN, biometrics, PKI/symmetric encryption) for a "secure facility" is a known security enhancement. A PHOSITA would be motivated to integrate known authentication methods to increase security where needed, especially in scenarios where user identity needs to be confirmed beyond a simple broadcast ID.
   • Supporting References:
     • WO 2006094048 A2 (Id-Confirm, Inc.) discloses "Systems and methods for biometric authentication."
     • US 20040117623 A1 (Kabushiki Kaisha Toshiba) discusses "Methods and apparatus for secure data communication links," which would motivate encrypting communications.
     • General knowledge of PKI and symmetric encryption for secure communication/authentication, which are standard cryptographic techniques. The patent itself labels PKI and Symmetric Encryption as "classical strong user authentication methods."

Combining these, a PHOSITA, motivated to improve the accuracy and security of vehicle access control systems (like Wherenet) and to leverage modern smartphone technology (BLE), would combine:

• Wherenet (US 20080129545 A1) for the core concept of RSSI-based relative vehicle positioning for access control.
• General knowledge/US 20160189324 A1 regarding the use of Bluetooth Low Energy (BLE) in mobile devices for proximity applications.
• Zheng et al. (2015) or general signal processing knowledge for averaging RSSI to enhance location accuracy, especially in multipath environments.
• WO 2006094048 A2 / US 20040117623 A1 and general cryptographic knowledge for implementing stronger user authentication and secure communications.

The motivation would be to provide a more accurate, reliable, and secure access control system that is compatible with widely available user handsets (smartphones), especially in environments where cellular data may be unreliable, building upon existing concepts of automated access using wireless signals. The parent application US 14/483,218 also provides a strong motivation for smartphone-based payment and access in garages, and US10783506 specifically builds on that by removing the cellular data link dependency.

Argument for Claim 21 (System):

Primary Reference: US 20080129545 A1 (Wherenet Corp.) - "System and method for determining the entry or exit lane of vehicles passing into or from a vehicle lot using tag interrogator and rssi".

• Disclosure: As discussed above, Wherenet provides a system with "tag interrogators" (beacon modules) and a "host" (server) to control vehicle access based on RSSI.
  • Match to Claim 21 elements:
    • A plurality of beacon modules using a wireless technology, wherein each beacon module has a beacon module identification: Wherenet uses multiple "interrogators" with IDs.
    • A server performing handset or user authentication: Wherenet has a "host" that processes tag IDs for access. Authentication beyond simple ID could be an obvious addition for security.
    • Beacon modules are configured to receive an identification signal from each of a plurality of radio transmitters, each radio transmitter being associated with a user: Wherenet interrogators receive signals from tags.
    • Measure a radio signal attribute which depends on the distance of the radio transmitter from the beacon module receiver: Wherenet measures RSSI, which is distance-dependent.
    • Determine a relative location of each radio transmitter, based on the radio signal attribute, with respect to an expected location compared to the relative locations of other radio transmitters with respect to the expected location: Wherenet determines which vehicle is in the correct lane (expected location) relative to others using RSSI patterns.
    • Determine that the user who is allowed access to the facility is the one that is most likely to be in the expected location: Wherenet aims to identify and grant access to the vehicle correctly positioned.

Missing elements from Wherenet (US 20080129545 A1) for Claim 21 and how to supplement them:

1. "low energy wireless technology" (e.g., Bluetooth Low Energy) for beacon modules and radio transmitters (handsets): Wherenet uses RFID.

   • Motivation: Same as for Claim 1. PHOSITA would integrate BLE for its advantages in smartphone integration, low power, and widespread use in beacon applications.
   • Supporting Reference: General knowledge of BLE, or US 20160189324 A1 (Ebay Inc.) for wireless beacons.

2. Explicit configuration for "averaging" the radio signal attribute (RSSI) for improved accuracy: Wherenet implies RSSI usage but doesn't detail averaging.

   • Motivation: Same as for Claim 1. Improving accuracy and robustness by reducing signal variations (e.g., multipath) is a known problem in wireless positioning. Averaging RSSI is a standard solution.
   • Supporting Reference: Zheng et al. (2015) for fingerprinting, which inherently benefits from stable RSSI, or general signal processing knowledge.

3. Stronger user authentication system components (e.g., biometric sensor, PKI/symmetric encryption for the server/handset): Wherenet implicitly handles authentication via tag ID.

   • Motivation: Same as for Claim 1. Enhancing security of an access control system is an obvious goal. Adding known strong authentication mechanisms would be a straightforward engineering choice.
   • Supporting References: WO 2006094048 A2 (Id-Confirm, Inc.) for biometric authentication, and US 20040117623 A1 (Kabushiki Kaisha Toshiba) for secure data links. Claim 30 of US10783506 explicitly adds a biometric sensor.

Overall Motivation for Combination:

A Person Having Ordinary Skill in the Art (PHOSITA) in the field of access control systems, particularly for vehicles, would have been motivated to combine these references to create a more robust, secure, and user-friendly system. The primary motivation would be to:

• Improve Accuracy and Reliability: Leverage techniques like RSSI averaging and fingerprinting (Zheng et al.) to overcome limitations of basic RSSI measurements (e.g., multipath, fast fading) and achieve sufficient accuracy (e.g., 1.5m, as mentioned in the patent) to distinguish between vehicles in close proximity, a problem directly addressed by Wherenet.
• Enhance User Experience and Convenience: Utilize widely available smartphone technology and low-energy wireless communication (BLE) (general knowledge, US 20160189324 A1) to eliminate the need for specialized RFID tags or reliance on potentially poor cellular coverage, as specifically noted in the background of US10783506. The parent application US 14/483,218 already established the concept of smartphone-based access/payment in garages, providing a clear path for further development.
• Increase Security: Integrate strong authentication methods (PKI, symmetric encryption, biometrics) (WO 2006094048 A2, US 20040117623 A1, general cryptographic knowledge) into the access control workflow to prevent unauthorized access, which is a constant concern for "secure facilities."

The combination would be a logical step for a PHOSITA seeking to upgrade existing vehicle access control systems (like Wherenet's) with more modern, efficient, and secure wireless technologies and localization techniques available by the patent's priority date.

Let's refine the specific combinations and explanations.

Combination 1 (for Method Claim 1):

• Primary Reference: US 20080129545 A1 to Wherenet Corp.
  • Discloses a system and method for determining the entry or exit of vehicles into a lot using interrogators (beacons) and RFID tags, measuring RSSI to distinguish vehicles in different lanes, and opening a gate. This covers the core steps of wireless signal reception, RSSI measurement, server processing to determine relative location of the nearest vehicle to an expected position, and gate opening.
• Secondary Reference A: Zheng, Zengwei et. al.; "Feature Learning for Fingerprint-Based Positioning in Indoor Environment"; 2015.
  • Discloses "fingerprint-based positioning" for indoor environments, a technique that inherently deals with RSSI variations and often involves averaging or similar methods to create stable "fingerprints" for accurate location. This would provide the motivation and technical means for "averaging the received signal strength indication values" to improve location accuracy, as described in US10783506. The patent itself mentions "time averaged RSSI values" and "fingerprinting techniques."
• Secondary Reference B: WO 2006094048 A2 to Id-Confirm, Inc.
  • Discloses "Systems and methods for biometric authentication." This provides the missing element of strong user authentication, demonstrating that it was known in the art to require a user input (e.g., biometric) to confirm identity for access control. This directly relates to the "strong authentication" elements in Claim 1 (e.g., biometric signature in claim 11).
• Secondary Reference C: US 20160189324 A1 to Ebay Inc. or general knowledge of BLE.
  • Discloses "Parking guidance and parking services provided through wireless beacons," indicating the use of wireless beacons (often BLE) for parking-related services. This would motivate a PHOSITA to use BLE as the "low energy wireless technology" in Wherenet's system, given its prevalence in smartphones and low power consumption, especially when US10783506 aims to avoid cellular data links.

Motivation for Combination 1:
A PHOSITA, skilled in access control and wireless location systems, would be motivated to combine Wherenet's system with the teachings of Zheng et al., Id-Confirm, and the use of BLE technology (Ebay/general knowledge) to create a more accurate, secure, and modern access control solution. Wherenet provides the foundation for RSSI-based relative positioning for vehicle access. However, Wherenet's system could suffer from RSSI fluctuations due to multipath. Zheng et al. would motivate applying signal averaging techniques to RSSI to create more reliable location "fingerprints." The need for enhanced security in access control facilities would motivate incorporating strong user authentication, such as biometrics from Id-Confirm, beyond a simple tag ID. Furthermore, the increasing ubiquity of smartphones with BLE capabilities would provide a clear motivation to adapt Wherenet's RFID tag system to use BLE-enabled handsets (as in Ebay's wireless beacons for parking), making the system more user-friendly and less reliant on dedicated hardware or cellular networks (a problem US10783506 explicitly addresses). The objective is to produce a state-of-the-art, secure, and robust access control system suitable for modern facilities.

Combination 2 (for System Claim 21):

• Primary Reference: US 20080129545 A1 to Wherenet Corp.
  • Discloses a system comprising multiple interrogators (beacon modules) and a host (server). The interrogators are configured to receive signals from tags, measure RSSI (radio signal attribute), and the system determines the relative location of vehicles for access control purposes.
• Secondary Reference A: WO 2006094048 A2 to Id-Confirm, Inc.
  • Discloses a system with "biometric authentication" components. This provides the system elements for "strong authentication" and "biometric sensor" (claim 30).
• Secondary Reference B: US 20160189324 A1 to Ebay Inc.
  • Discloses a system using "wireless beacons" for "parking guidance and parking services." This directly suggests beacon modules using wireless technology (e.g., BLE) and their application in a parking context, aligning with the "plurality of beacon modules using a wireless technology" element and the parking garage example in US10783506.
• Secondary Reference C: General knowledge regarding signal processing.
  • It is common knowledge in wireless communication and positioning that averaging received signal strength indications (RSSI) improves accuracy and mitigates noise and multipath effects. This would inform the configuration of the beacon modules and/or server to "average" RSSI values, even if Wherenet doesn't explicitly state it.

Motivation for Combination 2:
A PHOSITA, aiming to design an improved and secure access control system for facilities like parking garages, would be motivated to combine the system elements of Wherenet with those of Id-Confirm and Ebay, supplemented by general knowledge in signal processing. Wherenet provides the core architecture of beacon modules and a server for RSSI-based relative positioning to control access. However, to enhance security, the PHOSITA would integrate known strong authentication mechanisms, such as the biometric authentication system taught by Id-Confirm. To update the wireless technology for modern handsets and low-power operation, and to specifically target parking services, the PHOSITA would look to systems using "wireless beacons" like those described by Ebay for parking, which implies technologies like BLE. Finally, to ensure the accuracy and robustness of the RSSI-based location determination, a PHOSITA would apply standard signal processing techniques, such as averaging RSSI, which is generally understood to reduce noise and multipath effects in wireless communication systems. This combination leads to a system that is more accurate, secure, and utilizes contemporary wireless communication standards relevant to the stated problems in US10783506.

Let's do a final check of the claims and the proposed combinations.

Claim 1 (Method) and Claim 21 (System) both emphasize:

• Low energy wireless technology (like BLE).
• RSSI measurement and averaging.
• Determining relative location to an expected location.
• Authentication of the nearest user.
• Opening a gate if authorized.

The combination of Wherenet (RSSI-based relative vehicle positioning for access), Zheng et al. (fingerprinting/averaging for location accuracy), Id-Confirm (biometric/strong authentication), and the use of BLE (Ebay/general knowledge) covers these elements and provides a clear motivation for a PHOSITA to combine them for an improved access control system.
The problem solved by US10783506 is providing access control without requiring a cellular data link, especially in areas with poor coverage (e.g., parking garages). This problem would motivate the use of a local, short-range wireless technology like BLE, combined with existing solutions for location and authentication.

One more consideration: the mention of US patent application Ser. No. 14/483,218. The description states: "In the embodiments disclosed herein, the access control method of U.S. patent application Ser. No. 14/483,218 is complemented by a variation which does not required a cellular data link from the smartphone to a server." This directly indicates that the general concept of smartphone-based access to gated garages was already known from the parent application. This makes the step of applying known localization and authentication techniques to a smartphone/beacon system, while removing the cellular dependency, even more obvious. While I don't have the full text of US 14/483,218, its explicit mention in the background as a precursor supports the general inventive step being related to refining an existing concept, rather than inventing the core concept of smartphone-based garage access.

Therefore, the combination arguments seem strong.
I will structure the output by first stating the legal standard, then analyzing the independent claims, and finally presenting the combinations and motivations.## Obviousness Analysis of US Patent 10783506 under 35 U.S.C. § 103

This analysis assesses the obviousness of US Patent 10783506, titled "Methods and systems for access control to secure facilities," under 35 U.S.C. § 103, based on the prior art cited within the patent. The legal standard for obviousness requires determining whether the differences between the claimed invention and the prior art are such that the subject matter as a whole would have been obvious at the time the invention was made to a person having ordinary skill in the art (PHOSITA). This analysis will identify combinations of prior art references that would render the independent claims obvious and explain the motivation for a PHOSITA to combine these references.

Legal Standard for Obviousness (35 U.S.C. § 103)

Under 35 U.S.C. § 103, a patent may not be obtained "if the differences between the claimed invention and the prior art are such that the subject matter as a whole would have been obvious at the time the invention was made to a person having ordinary skill in the art to which said subject matter pertains." The Supreme Court's decision in KSR International Co. v. Teleflex Inc. emphasized a flexible approach, allowing for various rationales for combining prior art, including common sense, design needs, and market demands.

Independent Claims Overview

The patent contains two independent claims:

• Independent Claim 1 (Method Claim): Describes a method for controlling access to a facility by using handsets, beacon modules, and a server. Key steps include sending signals with user identification, determining and averaging received signal strength indication (RSSI) values, sending these values to a server, determining the nearest user/handset relative to an expected location, authenticating the user, and opening a gate. A critical aspect is determining the nearest user's location relative to others and confirming they are most likely in the expected access location.
• Independent Claim 21 (System Claim): Describes a system for controlling access, comprising a plurality of beacon modules and a server. The beacon modules are configured to receive identification signals, measure radio signal attributes (like RSSI), determine the relative location of radio transmitters (users/handsets) with respect to an expected location compared to others, and ascertain that the user allowed access is the one most likely to be in the expected location.

Analysis of Obviousness

The core inventive concepts in US10783506 revolve around using low-energy wireless technology (e.g., Bluetooth Low Energy or BLE) with multiple beacons to perform relative location determination (often via RSSI fingerprinting and averaging) of user handsets for access control, especially in scenarios where cellular coverage is poor (e.g., parking garages), and incorporating strong user authentication. The patent itself notes its methods complement US patent application Ser. No. 14/483,218 by not requiring a cellular data link from the smartphone to a server, indicating that smartphone-based access to garages was a known concept.

Combination 1: For Independent Claim 1 (Method)

A PHOSITA would have been motivated to combine the teachings of the following prior art references to arrive at the method claimed in Independent Claim 1:

1. US 20080129545 A1 (Wherenet Corp.): This patent discloses a system and method for determining the entry or exit of vehicles into or from a vehicle lot using RFID tags, interrogators (which function as beacon modules), and received signal strength indication (RSSI). It explicitly teaches using RSSI to determine the entry/exit lane of vehicles and distinguishing between multiple vehicles to ensure the correct vehicle is granted access, then opening a gate. This reference provides the foundational steps of using wireless signals, RSSI-based relative location, and automated gate control for vehicle access.
2. Zheng, Zengwei et. al.; "Feature Learning for Fingerprint-Based Positioning in Indoor Environment"; 2015: This non-patent literature describes "fingerprint-based positioning," a technique for determining location that often relies on creating a map of RSSI values. To achieve robust positioning, especially in environments with multipath interference, such systems typically involve averaging RSSI measurements. This reference provides the motivation and technical basis for "averaging the received signal strength indication values" to improve the accuracy and robustness of location determination, as explicitly mentioned in US10783506 for mitigating multipath-induced variations.
3. WO 2006094048 A2 (Id-Confirm, Inc.): This reference discloses "Systems and methods for biometric authentication." It teaches the implementation of strong user authentication methods using biometrics to confirm a user's identity for access control. This would provide the motivation and means for a PHOSITA to incorporate "strong authentication of the user" (e.g., using a biometric signature as in claim 11) into Wherenet's access control system.
4. US 20160189324 A1 (Ebay Inc.) or General Knowledge of Bluetooth Low Energy (BLE): This patent describes "Parking guidance and parking services provided through wireless beacons." By the priority date of US10783506 (August 28, 2015), Bluetooth Low Energy (BLE) was a widely adopted low-energy wireless technology, particularly prevalent in smartphones and beacon applications. A PHOSITA would be motivated to replace Wherenet's RFID tags with BLE-enabled handsets and beacons due to the ubiquity of smartphones, lower power consumption, and the explicit problem addressed by US10783506 of poor cellular coverage, favoring local short-range communication.

Motivation for Combination 1:
A PHOSITA in the field of access control systems, aiming to enhance the accuracy, security, and user-friendliness of vehicle access management, would find it obvious to combine these references. Wherenet provides the core framework for RSSI-based relative positioning to control vehicle access. However, a PHOSITA would recognize the need to improve the reliability of RSSI measurements, especially in dynamic environments, and would turn to techniques like RSSI averaging, as inherently suggested or used in fingerprinting methods taught by Zheng et al., to achieve more robust location determination. Given the context of "secure facilities," adding a layer of strong user authentication, such as the biometric methods taught by Id-Confirm, would be a natural and obvious security enhancement to ensure only authorized individuals gain access. Furthermore, recognizing the increasing prevalence of smartphones and the limitations of cellular networks in certain locations (e.g., parking garages), a PHOSITA would be motivated to adapt Wherenet's system to use readily available BLE technology in handsets and wireless beacons, as exemplified by Ebay's parking services, to create a more convenient and widely applicable solution. This combination addresses the desire for a modern, reliable, and secure access control system that leverages prevalent mobile technology without relying on cellular data, thereby solving a known problem in the art.

Combination 2: For Independent Claim 21 (System)

A PHOSITA would have been motivated to combine the teachings of the following prior art references to arrive at the system claimed in Independent Claim 21:

1. US 20080129545 A1 (Wherenet Corp.): This patent describes a system architecture comprising multiple "interrogators" (corresponding to beacon modules) and a "host" (corresponding to a server). The interrogators are configured to receive signals from tags (radio transmitters), measure RSSI (a radio signal attribute dependent on distance), and the system is designed to determine the relative location of vehicles for access control (e.g., determining which vehicle is in the correct lane) and control a gate.
2. WO 2006094048 A2 (Id-Confirm, Inc.): This reference discloses system components and architectures for "biometric authentication." This would guide a PHOSITA in configuring the system's server and/or associated devices (like a handset) to perform strong user authentication, potentially integrating a "biometric sensor" as claimed in US10783506.
3. US 20160189324 A1 (Ebay Inc.): This patent explicitly describes a system providing "Parking guidance and parking services provided through wireless beacons." This teaches the use of a "plurality of beacon modules using a wireless technology" in a context directly relevant to the target application of US10783506 (parking facilities).
4. General Knowledge in Wireless Communication and Signal Processing: It is well-established in the art that averaging received signal strength measurements improves accuracy and reduces variability caused by noise, fading, and multipath effects. A PHOSITA would, therefore, inherently configure the beacon modules or the server to perform such averaging of the measured radio signal attribute (RSSI) to enhance the precision of location determination.

Motivation for Combination 2:
A PHOSITA focused on developing an advanced and secure access control system, particularly for scenarios like parking facilities, would find it obvious to combine the system elements from Wherenet, Id-Confirm, and Ebay, coupled with general engineering principles. Wherenet provides the fundamental system architecture of interconnected beacon modules and a server for RSSI-based relative positioning and automated access control. To address the crucial aspect of security in an access control system, a PHOSITA would integrate known strong authentication mechanisms. Id-Confirm directly teaches system designs for biometric authentication, offering a clear solution for robust user verification. To update the wireless communication aspect for modern applications, especially in parking, the PHOSITA would look to systems employing "wireless beacons" like those described by Ebay, which would imply the use of contemporary low-energy wireless technologies such as BLE. Finally, to overcome known challenges with RSSI-based localization (e.g., signal fluctuations), a PHOSITA would apply the common knowledge that averaging RSSI values significantly enhances the accuracy and reliability of the measured radio signal attribute, thereby leading to a more effective location determination system. This integration of components and techniques would result in a system that is more secure, precise, and aligned with contemporary wireless technologies for facility access control.