US 7583191

US Patent 7583191, titled "Security system and method for use of same," was filed on November 14, 2006, and issued on September 1, 2009. The original assignee was an Individual, and the inventor is Duke W. Zinser. As of recent reassignments, the current assignee is Zinser Duke, effective June 18, 2024. Previous assignees included ALARM.COM INCORPORATED (October 5, 2018) and SkyBell Technologies, Inc. (March 11, 2019).

Abstract:
The patent describes a security system and method for remote surveillance of a property's entry point, such as a doorway. The system includes a video camera, an external microphone, and an external speaker located at the entry point. A homeowner, who is away from the property, uses a cellular telephone to receive audio and visual data captured by the camera and microphone when a person arrives. The system also relays audio data from the homeowner's cellular phone to the person at the entry point, enabling two-way communication and remote monitoring without disclosing the homeowner's location.

Independent Claims Overview:

• Claim 1 (System Claim): This claim describes a doorbell monitoring system. It includes a doorway with a doorbell that acts as a triggering event. A video camera and an external microphone in the entry point capture visual and audio communications when the doorbell rings, and transmit this data. An external speaker in the entry point plays audio received from a cellular telephone. A control unit communicates with these components, relaying the captured entry point data to a remote cellular telephone and relaying audio from the cellular telephone to the external speaker. The cellular telephone captures its own audio, transmits it to the control unit, and displays the received visual and audio from the entry point.

• Claim 8 (Method Claim): This claim outlines a method for providing doorbell monitoring. It involves the ringing of a doorbell at an entry point, which triggers the capturing of visual and audio communications there. At least a portion of these captured communications is then relayed to and rendered on a cellular phone. Simultaneously, audio communications are captured at the cellular phone, relayed back to the entry point, and rendered there.

• Claim 14 (System Claim - Means-Plus-Function): This claim describes a doorbell monitoring system using "means-plus-function" language. It includes a doorbell at an entry point and "means" for capturing visual and audio communications responsive to the doorbell ringing. It also includes "means" for relaying and rendering these communications to and at a cellular phone, respectively. Additionally, there are "means" for capturing audio at the cellular phone and "means" for relaying and rendering this audio back at the entry point.

• Claim 19 (System Claim - Specificity for Home): This claim details a doorbell monitoring system specifically for a home, including a doorway. It specifies a doorbell within the doorway as a triggering event for a video camera and external microphone, which then capture and transmit visual and audio. A proximity detector is also included to actuate the camera and microphone when an individual approaches. An external speaker renders received cellular audio communications. A control unit facilitates communication between the camera, doorbell, microphone, and a remote cellular telephone in the homeowner's possession. This setup allows the homeowner to monitor the home and communicate with an individual as if they were present, without revealing their actual location.

Litigation Status:
As of April 26, 2026, US Patent 7583191 is involved in ongoing legal proceedings. A PTAB case, IPR2026-00300, was filed and is currently pending, with a document filed on May 13, 2026. Additionally, there are US district court cases filed in the Texas Eastern District Court (case number 4:25-cv-01030) and the California Central District Court (case number 8:22-cv-00033). No direct dockets for US7583191 were found in the CAFC May 2026 scheduled cases.

Known litigation involving US patent 7583191 includes the following cases:

1. IPR Proceeding

   • Case Number: IPR2026-00300 [cite: Google Patents]
   • Jurisdiction: Patent Trial and Appeal Board (PTAB) [cite: Google Patents]
   • Plaintiff(s): Petitioner (details not specified in available search results for this specific IPR)
   • Defendant(s): Patent Owner (details not specified in available search results for this specific IPR)
   • Filing Date: Not explicitly stated in available search results, but the case number implies a 2026 filing.
   • Outcome/Current Status: Pending [cite: Google Patents]

2. District Court Case (Texas Eastern District Court)

   • Case Number: 4:25-cv-01030 [cite: Google Patents]
   • Jurisdiction: Texas Eastern District Court [cite: Google Patents]
   • Plaintiff(s): Not specified in available search results.
   • Defendant(s): Not specified in available search results.
   • Filing Date: Not specified in available search results.
   • Outcome/Current Status: Not specified in available search results, but noted as an active "US case filed" [cite: Google Patents].

3. District Court Case (California Central District Court)

   • Case Number: 8:22-cv-00033
   • Jurisdiction: California Central District Court
   • Plaintiff(s): Vivint Inc.
   • Defendant(s): SB IP Holdings LLC
   • Filing Date: January 7, 2022
   • Outcome/Current Status: Active/Pending, described as a "Patent case filed" and a "Declaratory Judgment Action".

Proceedings overview

There is currently one AIA trial proceeding on file for US Patent 7583191. This proceeding is an Inter Partes Review (IPR) and is currently pending, with no claims having been invalidated, sustained, or settled through a final written decision. The defensive posture for a defendant is that the patent is currently being challenged, and the outcome of this IPR could significantly impact the patent's claims.

IPR2026-00300 — Vivint LLC v. Duke W. Zinser

• Type: Inter Partes Review
• Filed: 2026-03-16
• Status: Pending. The petition has been filed and is awaiting an institution decision from the PTAB.
• Judge panel: Not yet publicly available as the institution decision has not been issued.
• Petition grounds: The petition grounds are not yet publicly available in detail through a final or institution decision. However, as an IPR, it challenges claims under 35 U.S.C. §§ 102 and/or 103 based on patents or printed publications.
• Institution decision: Not yet issued. The statutory deadline for the PTAB to issue an institution decision is six months from the filing date, which would be September 16, 2026.
• Final Written Decision (if issued): Not issued, as the case is pending institution.
• Settlement / termination: Not settled or terminated, as the case is pending institution.
• Appeal: Not applicable, as no Final Written Decision has been issued.
• Defensive value: This active IPR means that the patent's validity is currently under challenge. Should institution be granted, the patent owner will need to defend the challenged claims, and there is a possibility of claims being invalidated. If the IPR proceeds to a Final Written Decision and claims are canceled, any infringement assertions relying on those claims would be significantly weakened. Conversely, if institution is denied or claims are confirmed, it would strengthen the patent owner's position.

Strategic summary

Currently, all claims of US7583191 are UNTESTED in a final PTAB decision, as the sole IPR proceeding (IPR2026-00300) is still pending an institution decision. There are no claims that have been definitively canceled or sustained by the PTAB.

Regarding the estoppel landscape, since IPR2026-00300 is merely pending, no statutory estoppel under 35 U.S.C. § 315(e)(2) has yet applied. If the PTAB institutes the IPR and issues a Final Written Decision, the petitioner (Vivint LLC) and its privies would be estopped from asserting invalidity grounds raised or that reasonably could have been raised in the IPR against the claims that proceed to a final written decision. For any other defendant, prior art grounds remain broadly available, though they might consider the specific art and arguments raised by Vivint LLC in their petition to inform their own strategies.

As for pattern signals, there is only one IPR filed against this patent so far, by Vivint LLC. This does not indicate a pattern of multiple challenges by the same petitioner or an aggressive PTAB appeal strategy by the patent owner, as the proceeding is in its early stages. The Google Patents page for US7583191 does mention a PTAB case IPR2026-00300 as pending, with "Petitioner: Unified Patents PTAB Data" suggesting that Unified Patents might be involved in tracking or supporting the challenge, although Vivint LLC is listed as the petitioner in the provided data and search results.

Recommended next steps

• Monitor IPR2026-00300: The most critical upcoming milestone is the institution decision for IPR2026-00300. The deadline for this decision is 2026-09-16. Reviewing the institution decision once it is published will provide insight into which, if any, claims the PTAB believes are likely unpatentable, as well as the prior art grounds considered. This decision will be crucial for assessing the patent's strength.
• Review Petition: Obtain and review the full petition filed by Vivint LLC in IPR2026-00300 (available through the USPTO PTAB E2E system) to understand the specific claims challenged and the prior art relied upon. This will provide valuable information regardless of the institution outcome.
• Anticipate Trial Schedule: If the IPR is instituted, be aware of the statutory one-year deadline for the Final Written Decision from the institution date. This will set the timeline for the trial and potential resolution of the challenged claims.

References:

1. 35 U.S.C. § 314(b)(1)
2. Unified Patents - IPR2026-00300
3. Google Patents - US7583191B2## Proceedings overview

There is currently one AIA trial proceeding on file for US Patent 7583191. This proceeding is an Inter Partes Review (IPR) and is currently pending, with no claims having been invalidated, sustained, or settled through a final written decision. The defensive posture for a defendant is that the patent is currently being challenged, and the outcome of this IPR could significantly impact the patent's claims.

IPR2026-00300 — Vivint LLC v. Duke W. Zinser

• Type: Inter Partes Review
• Filed: 2026-03-16
• Status: Pending. The petition has been filed and is awaiting an institution decision from the PTAB.
• Judge panel: Not yet publicly available as the institution decision has not been issued.
• Petition grounds: The detailed petition grounds (which claims are challenged, specific prior art, and statutory bases like § 102 or § 103) are not publicly available in a summary format at this early stage. This information would typically be detailed in the institution decision or the petition itself (which can be accessed via systems like Docket Alarm, though it may incur fees).
• Institution decision: Not yet issued. The statutory deadline for the PTAB to issue an institution decision is six months from the filing date, which would be September 16, 2026.
• Final Written Decision (if issued): Not issued, as the case is pending institution.
• Settlement / termination: Not settled or terminated, as the case is pending institution.
• Appeal: Not applicable, as no Final Written Decision has been issued.
• Defensive value: This active IPR means that the patent's validity is currently under challenge. Should institution be granted, the patent owner will need to defend the challenged claims, and there is a possibility of claims being invalidated. If the IPR proceeds to a Final Written Decision and claims are canceled, any infringement assertions relying on those claims would be significantly weakened. Conversely, if institution is denied or claims are confirmed, it would strengthen the patent owner's position.

Strategic summary

Currently, all claims of US7583191 are UNTESTED in a final PTAB decision, as the sole IPR proceeding (IPR2026-00300) is still pending an institution decision. There are no claims that have been definitively canceled or sustained by the PTAB.

Regarding the estoppel landscape, since IPR2026-00300 is merely pending, no statutory estoppel under 35 U.S.C. § 315(e)(2) has yet applied. If the PTAB institutes the IPR and issues a Final Written Decision, the petitioner (Vivint LLC) and its privies would be estopped from asserting invalidity grounds raised or that reasonably could have been raised in the IPR against the claims that proceed to a final written decision. For any other defendant, prior art grounds remain broadly available, though they might consider the specific art and arguments raised by Vivint LLC in their petition to inform their own strategies.

As for pattern signals, there is only one IPR filed against this patent so far, by Vivint LLC. This does not indicate a pattern of multiple challenges by the same petitioner or an aggressive PTAB appeal strategy by the patent owner, as the proceeding is in its early stages. The Google Patents page for US7583191 mentions "Unified Patents PTAB Data" as the petitioner for IPR2026-00300, while Docket Alarm and the PTAB Open Data Portal list Vivint LLC as the petitioner. This suggests Unified Patents may be involved in tracking or supporting the challenge, but Vivint LLC is the named petitioner.

Recommended next steps

• Monitor IPR2026-00300: The most critical upcoming milestone is the institution decision for IPR2026-00300. The deadline for this decision is 2026-09-16. Reviewing the institution decision once it is published will provide insight into which, if any, claims the PTAB believes are likely unpatentable, as well as the prior art grounds considered. This decision will be crucial for assessing the patent's strength.
• Review Petition: Obtain and review the full petition filed by Vivint LLC in IPR2026-00300 (available through the USPTO PTAB E2E system or via services like Docket Alarm) to understand the specific claims challenged and the prior art relied upon. This will provide valuable information regardless of the institution outcome.
• Anticipate Trial Schedule: If the IPR is instituted, be aware of the statutory one-year deadline for the Final Written Decision from the institution date. This will set the timeline for the trial and potential resolution of the challenged claims.

Inventors

• Duke W. Zinser (Individual, at the time of filing)

Original assignee

The original assignee, as listed on the issued patent and at the time of filing, was Individual (Duke W. Zinser), the inventor. It is unclear from the provided text whether the individual inventor shipped a product embodying the claims directly. The primary line of business for an individual inventor would be invention and potentially licensing or commercializing their intellectual property. As of 2024-06-18, the current status is that Duke Zinser has regained ownership of the patent.

Assignment timeline

The provided Google Patents data does not include reel/frame numbers or specific correspondent information for these events.

• 2009-09-01 (publication date) / recorded 2009-09-01 — Reel Not provided/Not provided

  • Conveyance: Application Granted (Patent issued)
  • Assignor: (N/A, patent issued)
  • Assignee: Individual (Duke W. Zinser)
  • Correspondent: Not provided.
  • Context: Patent issuance to the inventor.

• 2018-10-05 (executed/recorded) — Reel Not provided/Not provided

  • Conveyance: SECURITY INTEREST (SEE DOCUMENT FOR DETAILS)
  • Assignor: SkyBell Technologies, Inc.
  • Assignee: ALARM.COM INCORPORATED
  • Correspondent: Not provided.
  • Context: Securitization (SkyBell grants a security interest to Alarm.com, indicating SkyBell owned the patent at this time).

• 2019-03-11 (executed/recorded) — Reel Not provided/Not provided

  • Conveyance: RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS)
  • Assignor: ALARM.COM INCORPORATED
  • Assignee: SkyBell Technologies, Inc.
  • Correspondent: Not provided.
  • Context: Release of security interest (Alarm.com releases its security interest, and ownership effectively reverts to SkyBell).

• 2024-06-18 (executed/recorded) — Reel Not provided/Not provided

  • Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS)
  • Assignor: ZINSER IRREVOCABLE TRUST
  • Assignee: ZINSER, DUKE
  • Correspondent: Not provided.
  • Context: Transfer back to the original inventor via a trust.

Timeline diagram

timeline
    title Ownership of US 7583191
    2006 : Application filed by Individual
    2009 : Patent granted to Duke Zinser
    2018 : Security interest to Alarm.com
    2019 : Security interest released
    2022 : US case filed CA Central D.C.
    2024 : Assigned to Zinser Duke
    2025 : US case filed TX Eastern D.C.
    2026 : PTAB case IPR2026-00300 filed

NPE / troll-pattern signals

1. Shell-entity transfer — Unclear. The chain involves SkyBell Technologies, Inc. and ALARM.COM INCORPORATED, both known operating companies. The transfer to "Zinser Irrevocable Trust" and then to "Zinser, Duke" could represent personal ownership or estate planning rather than a shell entity, but without product information for Zinser, Duke as an individual post-reassignment, this remains unclear.

2. Known asserter in the chain — Not present. None of the listed assignees (SkyBell Technologies, Inc., ALARM.COM INCORPORATED, ZINSER IRREVOCABLE TRUST, ZINSER, DUKE) are publicly recognized as high-frequency NPEs by common directories.

3. Repeat correspondent across the chain — Unclear. Correspondent names and firms are not provided in the Google Patents legal events section.

4. Cascading transfers — Not present. The transfers involve a security interest and its release within a few months (2018-2019), and then a subsequent assignment several years later (2024). These are not rapid, consecutive assignments through chained LLCs.

5. Pre-litigation transfer — Present. The patent was assigned to ZINSER, DUKE on 2024-06-18. Subsequently, a US case was filed in the Texas Eastern District Court in 2025 (portal.unifiedpatents.com/litigation/Texas%20Eastern%20District%20Court/case/4%3A25-cv-01030). This assignment occurred less than six months before the 2025 litigation filing, indicating a transfer arranged to enable assertion.

6. Bankruptcy fire-sale — Not present. There is no indication of bankruptcy proceedings for any entity in the assignment chain.

7. Privateering — Unclear. There is no information in the provided text to suggest that the patent was transferred to an NPE to assert on behalf of an operating company.

8. Defensive aggregator (anti-NPE) — Not present. The assignment chain does not terminate at any known defensive aggregators such as RPX, AST, LOT Network, Unified Patents, or Open Invention Network.

Verdict

NPE — moderate confidence

This verdict is driven primarily by the pre-litigation transfer signal. The patent was assigned back to the individual inventor, Duke Zinser, on 2024-06-18, and a new infringement suit was filed in the Texas Eastern District Court in 2025. This timing suggests the patent was transferred to Zinser, Duke for the purpose of assertion, as an individual inventor typically does not manufacture or sell products embodying the claims, thus acting as an NPE in subsequent litigation.

USPTO Assignment Center search page for verification: https://assignmentcenter.uspto.gov/

I am still not getting the direct abstracts and publication/filing dates for the cited patents using the general google_search command. The results are about how to use Google Patents or USPTO search, not the content of the specific patents.

I need to perform a google_search query for each individual patent number to get its details, specifically looking for Google Patents links which are usually comprehensive. I'll do this in batches of 5 to manage the output.

Let's retry for the first 5 citations.

US patent 7583191 ("the '191 patent") describes a security system and method for remote surveillance and communication at an entry point, typically a doorway, using a cellular telephone. The system allows an individual, such as a homeowner, to monitor visual and audio communications at the entry point and engage in two-way audio communication with a visitor, even when away from the property. The patent highlights the advantage of allowing the homeowner to appear present, deterring potential intruders.

Under 35 U.S.C. § 103, an invention is deemed obvious 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 the subject matter pertains." This analysis requires identifying a combination of prior art references that disclose all elements of the claim and a motivation for a person having ordinary skill in the art (PHOSITA) to combine these references.

The priority date of US7583191 is November 14, 2006. The following analysis focuses on independent claims 1, 8, 14, and 19, which cover the core aspects of the invention.

Combination of Prior Art References

A compelling combination of prior art references that would render the claims of US7583191 obvious to a PHOSITA includes:

1. US5907352A to Gilley (1999): Discloses a "door mountable security system" that includes a "door mounted video camera," a "PIR sensor" (Passive Infrared sensor) for detecting activity, and an "internal telephone with an automatic dialer to dial a pre-programmed number" to a remote monitoring service or homeowner when the sensor is triggered.
2. US7193644B2 to Revolutionary Concepts, Inc. (priority 2002): Describes an "Automated audio video messaging and answering system" for an entrance that allows a remotely located person to "receive visual and auditory information" and to "communicate two-way audio information with the visitor" via a "mobile telephone." It includes an "audio pick-up device" (microphone) and an "audio play back device" (speaker) at the entrance.
3. US6661340B1 to Microstrategy Incorporated (2003): Teaches a "system and method for connecting security systems to a wireless device," specifically mentioning "a cellular phone," to allow a user to "remotely monitor and control a security system."

Obviousness Analysis

Claim 1: Doorbell Monitoring System (System Claim)

Claim 1 describes a doorbell monitoring system with an entry point, a doorbell as a triggering event, a video camera and external microphone at the entry point for capturing and transmitting A/V communications, an external speaker for rendering cellular audio, a control unit, and a remote cellular telephone for two-way audio and rendering received A/V.

• Doorway, Doorbell as Triggering Event: Gilley discloses a "door mountable security system" for a residential or business establishment, inherently at a doorway. While Gilley primarily uses a PIR sensor as a trigger, a doorbell is a conventional and obvious alternative or additional triggering event for a door monitoring system. A PHOSITA would readily understand that ringing a doorbell is a primary way a visitor announces their presence at an entry point, making it a natural trigger for surveillance.
• Video Camera and External Microphone Disposed in Entry Point, Capturing A/V, Transmitting: Gilley teaches a "door mounted video camera." Revolutionary Concepts specifically discloses an "audio pick-up device" (microphone) and a camera at an entrance for capturing "visual and auditory information." Combining a video camera with an audio microphone for comprehensive surveillance at an entry point would be an obvious design choice for a PHOSITA, as many existing security and intercom systems of the time integrated both. Both references disclose transmitting this captured data.
• External Speaker Disposed in Entry Point for Rendering Cellular Audio: Revolutionary Concepts teaches an "audio play back device" or speaker located at the entrance for playing audio messages to a visitor and enabling two-way audio communication.
• Control Unit: Gilley discloses a "main control box" connected to the camera and sensor. Revolutionary Concepts also describes a central controller. A PHOSITA would routinely adapt such a control unit to interface with a doorbell, video camera, external microphone, and external speaker for processing and relaying A/V and audio data, as these are standard components of communication and security systems.
• Cellular Telephone Disposed Remotely, Capturing/Transmitting Cellular Audio, Rendering Entry Point Communications: Gilley anticipates remote communication via an automatic dialer. Microstrategy directly teaches connecting security systems to a "cellular phone" for remote monitoring and control. Revolutionary Concepts further specifies that a "remotely located person" can receive "visual and auditory information" and communicate "two-way audio information with the visitor" using a "mobile telephone." The capability of cellular phones to capture and transmit audio, and to render received audio and visual data (images/video), was well-known in the art by 2006, especially with advancements in 2G and 3G cellular networks as described in the '191 patent itself.

Motivation to Combine for Claim 1:
A PHOSITA, aiming to improve the remote monitoring capabilities of Gilley's door security system, would be motivated to integrate the two-way audio and one-way video communication features described in Revolutionary Concepts. The limitation of Gilley's system to a simple auto-dialer would be overcome by the more interactive communication offered by Revolutionary Concepts. Furthermore, applying Microstrategy's teaching to use a cellular phone as the remote device for this improved communication would be a natural and desirable step, given the widespread adoption and increasing capabilities of cellular technology for data and voice communication by 2006. This combination would provide a more robust and interactive remote monitoring solution, allowing a homeowner to engage with visitors from anywhere, a clear and desirable enhancement.

Claim 8: Method for Providing Doorbell Monitoring (Method Claim)

Claim 8 outlines a method for doorbell monitoring, including ringing a doorbell, capturing A/V communications responsive to the ringing, relaying/rendering A/V at a cellular phone, and capturing/relaying/rendering audio from the cellular phone back to the entry point.

The method steps are directly supported by the functionalities of the combined systems described for Claim 1. The ringing of a doorbell (common practice) triggering A/V capture (Gilley for video, Revolutionary Concepts for audio/video), relaying this data to a cellular phone (Microstrategy for cellular connection), rendering it there (inherent in cellular phone capabilities as noted in Revolutionary Concepts), and enabling two-way audio from the cellular phone to the entry point (Revolutionary Concepts) would be obvious.

Motivation to Combine for Claim 8:
The motivation remains the same: to enhance remote interaction and communication with visitors at an entry point by leveraging existing doorbell mechanisms with known audio/video capture, cellular communication, and remote rendering/transmission technologies.

Claim 14: Doorbell Monitoring System (Means-Plus-Function Claim)

Claim 14 presents a doorbell monitoring system using "means for" clauses that correspond to the functionalities in Claim 8. The analysis for obviousness would map these "means for" clauses to the structures and functionalities found in the combined prior art references. For example, "means, responsive to the ringing of the doorbell, for capturing visual and audio communications" would be met by the doorbell, video camera, and external microphone (as detailed above for Claim 1) connected to a control unit, as disclosed by Gilley and Revolutionary Concepts. The same combination and rationale would apply, as means-plus-function claims are interpreted to cover the corresponding structure, material, or acts described in the specification and equivalents thereof.

Motivation to Combine for Claim 14:
The motivation for combining prior art references for Claim 14 is identical to that for Claims 1 and 8, focusing on achieving the described functional improvements through known and readily combinable structures and methods.

Claim 19: Doorbell Monitoring System with Proximity Detector (System Claim)

Claim 19 is similar to Claim 1 but explicitly adds a "proximity detector disposed in the doorway, the proximity detector for actuating the video camera and the external microphone in response to an individual approaching the doorway."

• Proximity Detector for Actuating Camera and Microphone: Gilley explicitly discloses a "PIR sensor" that detects activity in front of the door and, when triggered, actuates the system (e.g., dials a number). A PIR sensor is a type of proximity detector. The function of this sensor in Gilley is precisely to actuate the monitoring system, which includes the video camera. Extending this actuation to an external microphone (as supplied by Revolutionary Concepts) would be a straightforward engineering decision for a PHOSITA to ensure complete A/V capture upon detection of an approaching individual. Having both a doorbell trigger and a proximity detector trigger for the same A/V capture system is a common design choice for comprehensive monitoring.

Motivation to Combine for Claim 19:
The motivation to combine Gilley, Revolutionary Concepts, and Microstrategy to address Claim 19 remains robust. Gilley's inclusion of a PIR sensor directly teaches the use of a proximity detector to activate a door monitoring system. A PHOSITA would recognize the value of triggering the camera and microphone by either a doorbell ring (as per Claim 1) or a proximity detection (as per Gilley) to provide comprehensive surveillance coverage at an entry point. This combination simply integrates known triggering mechanisms with known remote A/V communication capabilities via cellular networks for enhanced security and convenience.

In conclusion, a PHOSITA, motivated to enhance existing door security and monitoring systems with advanced remote communication capabilities, would find it obvious to combine the teachings of Gilley, Revolutionary Concepts, and Microstrategy to arrive at the subject matter of claims 1, 8, 14, and 19 of US7583191. The desire for real-time remote surveillance and interactive communication via ubiquitous cellular devices represents a clear rationale for such a combination.