US 9961097

Analysis of U.S. Patent 9,961,097: A System for Remote Premises Access

Washington D.C. - A detailed analysis of United States Patent 9,961,097, titled "System for remote access of a user premises," reveals a system designed to allow users to monitor and control devices within their property from a remote location via the internet. The patent, issued on May 1, 2018, has been the subject of litigation and is assigned to Portus Singapore Pte Ltd.

Key Patent Details:

• Title: System for remote access of a user premises
• Assignee: Portus Singapore Pte Ltd.
• Inventors: Charles Cameron Lindquist, Timothy John Lindquist
• Filing Date: November 10, 2014
• Issue Date: May 1, 2018
• Abstract: The patent describes a home security and control system featuring an internet browser that connects to an external network (extranet). This extranet contains a communications server that can connect on-demand to a specific "connection gateway" located within a user's home. This gateway, in turn, controls and monitors at least one security device in the home. By accessing a predetermined web address, a user can initiate a connection through the server to their home's gateway to manage their security devices. The system envisions the extranet operating as a Virtual Private Network (VPN) over the public internet.

Plain-Language Overview of Independent Claims:

U.S. Patent 9,961,097 has three independent claims which form the core of the protected invention. In plain language, these claims are as follows:

Independent Claim 1: This claim outlines a complete system for remote access. It comprises a user's device with a web browser, a secure external network, and a "connection gateway" at the user's premises. The process begins when a user inputs a specific web address (URL). This action connects the user's device to the secure external network. After the user provides authentication credentials, the system verifies their authority and identifies the specific property they are permitted to access from a plurality of potential premises. A new, direct communication session is then established between the user's device and the connection gateway at their property. Through this session, the external network can retrieve information from the networked devices at the user's premises and present it to the user. A key feature is that the external network can also receive and store information from the premises' devices for later review by the user, and the initial authentication grants access to both live control and this stored information.

Independent Claim 19: This claim essentially describes the same system as Claim 1 but focuses on the user's interaction through a "user interface." It details the sequence where a user enters a URL via this interface, which triggers the connection to the external network. Following successful authentication, the system connects to the appropriate gateway, and information from the local networked devices is then displayed on the user's interface. Like the first claim, it emphasizes that the user's initial authentication also authorizes them to access and review previously stored information from their premises' devices on the external network.

Independent Claim 23: This claim also lays out the architecture of the remote access system but with a slight emphasis on the control aspect. It describes that after a user enters a URL and authenticates, the external network serves information to the user's browser. By interacting with this presented information, the user can control the networked components at their premises. This control is achieved through the communication session established between the external network and the connection gateway, crucially without a direct communication link between the external network and the individual components themselves. This claim also reiterates the system's capability to store information from the local devices on the external network for subsequent review, all accessible via the single initial authentication.

Litigation and CAFC Docket Status:

A search of the United States Court of Appeals for the Federal Circuit (CAFC) dockets for the year 2026 did not reveal any active cases specifically referencing US Patent 9,961,097. However, it should be noted that public records indicate this patent has been involved in litigation in prior years. A comprehensive understanding of its full litigation history would necessitate a more in-depth search of legal databases. No uncertainty is noted regarding the core details of the patent itself, as this information is authoritatively provided by the United States Patent and Trademark Office.

Litigation History of U.S. Patent 9,961,097

As of May 1, 2026, U.S. Patent 9,961,097, assigned to Portus Singapore Pte Ltd., has been asserted in numerous patent infringement lawsuits across various U.S. District Courts. The patent holder has engaged in litigation against multiple companies, primarily in the smart home, security, and telecommunications industries. The following is a list of known litigation involving this patent, compiled from public court records and patent litigation databases.

Key Litigant:

• Plaintiff: In the cases listed, the plaintiff is consistently Portus Singapore Pte Ltd. (often with its Australian subsidiary, Portus Pty Limited).

Utah District Court

• Plaintiff(s): Portus Singapore Pte Ltd.
• Defendant(s): Vivint Smart Home, Inc.
• Jurisdiction: U.S. District Court for the District of Utah
• Case Number: 2:24-cv-00343
• Filing Date: April 29, 2024
• Status/Outcome: The current status of this case is pending.

Texas Western District Court

• Plaintiff(s): Portus Singapore Pte Ltd.

• Defendant(s): Reolink Digital Technology Co., Ltd.

• Jurisdiction: U.S. District Court for the Western District of Texas

• Case Number: 6:22-cv-00545

• Filing Date: May 27, 2022

• Status/Outcome: Records indicate this case was terminated on October 7, 2022; the specific outcome (e.g., settlement, dismissal) is not specified in the available data.

• Plaintiff(s): Portus Singapore Pte Ltd.

• Defendant(s): Wyze Labs, Inc.

• Jurisdiction: U.S. District Court for the Western District of Texas

• Case Number: 6:22-cv-00546

• Filing Date: May 27, 2022

• Status/Outcome: This case is listed as terminated.

Texas Eastern District Court

• Plaintiff(s): Portus Singapore Pte Ltd. & Portus Pty Ltd.

• Defendant(s): Trane Technologies Company LLC

• Jurisdiction: U.S. District Court for the Eastern District of Texas

• Case Number: 2:26-cv-00336

• Filing Date: April 23, 2026

• Status/Outcome: As a recently filed case, it is currently pending.

• Plaintiff(s): Portus Singapore Pte Ltd.

• Defendant(s): AT&T Inc. (specifically targeting AT&T Digital Life)

• Jurisdiction: U.S. District Court for the Eastern District of Texas

• Case Number: 2:19-cv-00044

• Filing Date: February 7, 2019

• Status/Outcome: The case was terminated. An expert witness report notes the matter settled out of court.

Texas Northern District Court

• Plaintiff(s): Portus Singapore Pte Ltd.
• Defendant(s): AXP Group (Vivint)
• Jurisdiction: U.S. District Court for the Northern District of Texas
• Case Number: 3:19-cv-00310
• Filing Date: February 7, 2019
• Status/Outcome: This case has been closed.

Illinois Central District Court

• Plaintiff(s): Portus Singapore Pte Ltd.
• Defendant(s): Zmodo Technology
• Jurisdiction: U.S. District Court for the Illinois Central District Court (previously listed as Northern District of Illinois)
• Case Number: 2:19-cv-02029
• Filing Date: February 7, 2019
• Status/Outcome: This case has been closed.

Additional cases are noted in litigation databases, though specific details may vary. The litigation history demonstrates a clear and consistent effort by Portus Singapore Pte Ltd. to enforce its rights under US Patent 9,961,097 against various technology providers.

Proceedings overview

As of May 15, 2026, a comprehensive search for America Invents Act (AIA) trial proceedings related to U.S. Patent 9,961,097 reveals no PTAB activity on file. The USPTO Open Data Portal (ODP) API indicates no records, and supplemental web searches for Inter Partes Review (IPR), Post-Grant Review (PGR), or Covered Business Method (CBM) proceedings for this patent did not yield any results.

This means all claims of US 9,961,097 remain untested by PTAB proceedings. For a defendant facing assertion of this patent, this indicates that the patent has not been subjected to the scrutiny of an IPR, PGR, or CBM trial, and thus its claims have not been challenged or narrowed by the PTAB.

Recommended next steps

Since there is no PTAB activity on file for US Patent 9,961,097, a defendant being asserted against this patent has the full range of PTAB trial options (IPR, PGR, or CBM, if applicable) available to them, provided statutory and regulatory requirements are met. The absence of PTAB challenges for a patent that has been involved in litigation (as indicated in the "Litigation History" section) could be a signal that either the patent owner has consistently settled cases before PTAB filings, or potential petitioners have not yet identified strong grounds for invalidity that meet the institution thresholds.

For a defendant, the immediate next steps would involve a thorough prior art search to identify potential invalidity grounds for an IPR or PGR petition, considering the patent's priority date of December 17, 1998. Analyzing the cited prior art (e.g., U.S. Patent 5,850,520; U.S. Patent 6,144,998; U.S. Patent 6,292,834) and searching for additional art would be critical.

Inventors

• Charles Cameron Lindquist
• Timothy John Lindquist

The patent document does not explicitly state the inventors' employer at the time of filing. However, Portus Singapore Pte Ltd is named as the original assignee on the patent, suggesting the inventors were likely employed by or affiliated with Portus Singapore Pte Ltd (or its Australian predecessor) when the application was filed.

Original assignee

Portus Singapore Pte Ltd.

• Shipped a product embodying the claims: No. Portus Singapore Pte Ltd explicitly states in its litigation filings that it "has never sold a product" and identifies itself as "a non-practicing entity, with no products to mark." While the company claims to be the "original creator of the smart home" and to have developed "valuable and industry-leading smart home systems," this is presented in the context of patent assertion and licensing rather than direct product sales.
• Primary line of business: Officially, its primary activity is listed as "INTERNET ACCESS PROVIDERS, INCLUDE ISPS" with "OTHER HOLDING COMPANIES" as a secondary activity, incorporated in Singapore. However, its actual business model, as evidenced by its activities, is focused on acquiring and asserting patents related to smart home and remote monitoring systems through a "Patent Licensing Program".
• Current status: Live and operating.

Assignment timeline

A search of the USPTO Patent Assignment Search database for patent number US9961097 revealed no recorded assignments for this patent. This indicates that the original assignee, Portus Singapore Pte Ltd, remains the recorded owner of the patent, and no post-issuance transfers have been documented.

Timeline diagram

timeline
    title Ownership of US 9961097
    1998 : Priority date
    2014 : Application filed by Portus Singapore Pte Ltd
    2018 : Patent issued to Portus Singapore Pte Ltd
    2019 : First infringement suit filed by Portus

NPE / troll-pattern signals

1. Shell-entity transfer — Present. Portus Singapore Pte Ltd openly identifies itself as a "non-practicing entity" and states that it "has never sold a product." Its stated primary business activities (Internet access providers, other holding companies) do not align with the manufacture or sale of smart home products. Its operations revolve around a "Patent Licensing Program."
2. Known asserter in the chain — Present. Portus Singapore Pte Ltd is widely recognized as a "non-practicing entity" (NPE) by sources such as Unified Patents and RPX Corporation. The company has initiated a substantial number of patent infringement lawsuits against various technology providers, including Amazon, Samsung, LG, Peloton, and Vivint.
3. Repeat correspondent across the chain — Not present. There are no recorded assignments for US9961097 on the USPTO Assignment Center, thus no chain of assignments to analyze for recurring correspondents.
4. Cascading transfers — Not present. No assignments are recorded for this patent.
5. Pre-litigation transfer — Not present. The patent was issued on May 1, 2018. The earliest identified litigation (Case Number 2:19-cv-00044) was filed on February 7, 2019. There are no recorded assignments of the patent within six months prior to this first litigation filing.
6. Bankruptcy fire-sale — Not present. There is no evidence suggesting that Portus Singapore Pte Ltd or any prior (unrecorded) assignee underwent bankruptcy proceedings. Portus Singapore Pte Ltd is currently listed as an active company.
7. Privateering — Unclear. While Portus has licensed its technology to companies like Apple, Cisco, and Comcast, and has government investment, there is no explicit public record indicating that its litigation efforts are conducted specifically on behalf of these operating companies against their direct competitors.
8. Defensive aggregator (anti-NPE) — Not present. The patent remains with Portus Singapore Pte Ltd, which is actively asserting it in litigation.

Verdict

NPE — high confidence

Justification: Portus Singapore Pte Ltd explicitly declares itself a "non-practicing entity" that "has never sold a product" but operates a "Patent Licensing Program". This, combined with the extensive and continuous pattern of patent infringement litigation against a wide array of technology companies, provides strong and unequivocal signals of an NPE. The absence of recorded assignments for the patent number on the USPTO Assignment Center confirms that the patent remains with this identified NPE. For verification, refer to the USPTO Patent Assignment Search.

Analysis of Prior Art Cited in U.S. Patent 9,961,097

As of May 5, 2026, a technical analysis of the prior art cited during the examination of U.S. Patent 9,961,097 ("the '097 patent") reveals several key references that were considered by the USPTO examiner. These references provide context for the state of the art at the time of the invention and help define the scope of the patent's claims. Below is a review of the most relevant cited patents and their potential impact on the claims of the '097 patent.

The '097 patent has a priority date of December 17, 1998, which is a critical factor in this analysis. Any prior art must have been publicly available before this date to be considered for anticipation under 35 U.S.C. § 102.

Key Prior Art References and Potential Anticipation

The examiner of the '097 patent cited several earlier patents. The following are the most pertinent references and an analysis of the specific claims they might anticipate.

1. U.S. Patent 5,850,520: "System for providing personalized on-line services and for facilitating electronic commerce"

• Full Citation: U.S. Patent 5,850,520
• Publication Date: December 15, 1998
• Filing Date: June 7, 1995
• Brief Description: This patent, assigned to IBM, describes a system for providing personalized online services. It details a network architecture where users can connect to a server to access customized information and services. It includes concepts of user profiles, authentication, and the dynamic generation of content based on user identity and preferences. The system allows users to interact with various services through a network.
• Potential Anticipation of Claims: This reference is highly relevant. It discloses a system with a user device (a "client system"), a network, and a server ("Web server") that authenticates a user and provides access to services. This architecture bears a strong resemblance to the system described in the '097 patent.
  • Claims 1, 19, 23: The '520 patent appears to teach the core elements of the independent claims: a user accessing a network via an address (URL), providing authentication, and the server responsively providing information or enabling control. It describes a "user profile" which could be analogous to the authentication data in the '097 patent that determines which resources a user can access. The concept of serving personalized information based on user identity mirrors the '097 patent's process of determining which "user premises" a user is authorized to access. However, a key distinction may lie in the '097 patent's specific configuration of a "connection gateway" at the user premises which establishes an on-demand, new communication session to the local network devices, as opposed to a more general-purpose server providing online services.

2. U.S. Patent 6,144,998: "Web-based remote control and monitoring system"

• Full Citation: U.S. Patent 6,144,998
• Publication Date: November 7, 2000
• Filing Date: March 28, 1997
• Brief Description: This patent discloses a system for remotely monitoring and controlling devices using a standard web browser. It describes a "control server" that communicates with various devices over a network. A remote user with a web browser can connect to this control server to view the status of and send commands to the connected devices. The system architecture involves a client, a server, and the end devices being controlled.
• Potential Anticipation of Claims: This reference is also highly relevant as it explicitly deals with web-based remote control, a central theme of the '097 patent.
  • Claims 1, 19, 23: The '998 patent teaches the use of a web browser and a URL to access a server that in turn controls remote devices. This aligns with the initial steps outlined in the '097 patent's independent claims. The '998 patent describes a "control server" that functions similarly to the "second hardware processing circuitry" in the '097 patent. The potential point of novelty for the '097 patent would again be its specific architecture involving an intermediate "connection gateway" at the premises and the establishment of a new, on-demand session for communication, which might not be explicitly detailed in the '998 patent's system.

3. U.S. Patent 6,292,834: "Method and apparatus for providing a persistent network connection to a local device"

• Full Citation: U.S. Patent 6,292,834
• Publication Date: September 18, 2001
• Filing Date: October 28, 1998
• Brief Description: This patent, filed by 3Com Corporation, describes a system that allows a local device, which may not have a permanent IP address, to be accessible from a wide area network like the Internet. It involves a "rendezvous server" that maintains the current connection information for the local device. A client wanting to connect to the local device first contacts the rendezvous server to get the necessary information to establish a direct connection.
• Potential Anticipation of Claims: This reference is significant because it addresses the problem of connecting to a local network that is not always "on" or publicly accessible, a scenario implied in the '097 patent's on-demand connection.
  • Claims 1, 19, 23: The '834 patent's "rendezvous server" performs a role analogous to the "second hardware processing circuitry" or "communications server" in the '097 patent. It facilitates the connection between a remote user and a local network device. The process of a remote client contacting a central server to initiate a connection to a specific local endpoint is a key element shared with the '097 patent. The distinction for the '097 patent may be its integration with a web browser-based URL access as the initiating step and the specific role of the "connection gateway" in managing multiple local devices and storing event data. The '097 patent's claims also include user authentication at the central network level to determine which of a plurality of premises to connect to, which may be a more specific implementation than that described in the '834 patent.

Obviousness Analysis of U.S. Patent 9,961,097 Under 35 U.S.C. § 103

As of May 31, 2026, an analysis of U.S. Patent 9,961,097 ("the '097 patent") under 35 U.S.C. § 103 suggests that its independent claims (Claims 1, 19, and 23) would likely have been obvious to a person having ordinary skill in the art (POSITA) at the time of the invention (priority date of December 17, 1998). This conclusion is drawn from a combination of the prior art references cited during the patent's examination, coupled with the general knowledge and motivations of a POSITA in the networking and web technology fields.

Identified Combinations of Prior Art

The following combinations of prior art references, along with general knowledge in the field, would render the independent claims of the '097 patent obvious:

1. Combination of U.S. Patent 6,144,998 (Web-based remote control) and U.S. Patent 5,850,520 (Personalized online services).

• Motivation for Combination: A POSITA in 1998, observing the growing demand for remote monitoring and control of home environments, and seeking to improve existing web-based remote control systems, would naturally look to enhance user experience through personalization and centralized access management. U.S. Patent 6,144,998 (the '998 patent) teaches the fundamental concept of remotely controlling devices via a web browser and a central server. U.S. Patent 5,850,520 (the '520 patent) describes a system for providing personalized online services, including user authentication and dynamic content generation based on user profiles. The motivation would be to combine the remote device control capabilities of '998 with the personalized, secure access and multi-user/multi-resource management features of '520 to create a more sophisticated and scalable system for remote premises access.

• Obviousness Argument:

  • Core System Architecture (First hardware, access browser, second hardware, first network, connection gateway): The '998 patent explicitly teaches a user device (first hardware) with a web browser (access browser module) connecting to a "control server" (second hardware processing circuitry) over a network (first network) to monitor and control remote devices. It would be an obvious architectural decision for a POSITA designing a system for a "user premises" with potentially multiple, diverse networked components to introduce a local "connection gateway" at the premises. This gateway would act as a hub or router, aggregating communication from the local devices and presenting a single point of contact to the external "control server." The '097 patent itself describes the connection gateway as "a hub and Internet connection mechanism for connected devices." This is a well-understood function of networking hardware, facilitating communication across different local network protocols (e.g., HomePnP, Bluetooth, HAVi, as mentioned in the '097 patent's description).
  • External Location and On-Demand Communication: The '998 patent's "control server" is external to the devices and communicates with them as needed for monitoring and control, inherently an "on-demand" interaction. Interposing a local premises gateway would simply mean the external server communicates with this gateway on-demand.
  • No Direct Communicative Coupling: By introducing a premises gateway as an intermediary, the external "control server" would naturally communicate with the gateway, which then communicates with the individual networked components. This results in the "without a direct communicative coupling between the second hardware processing circuitry and the at least one networked component" feature, as a consequence of this obvious architectural choice.
  • Plurality of Premises and Authentication-Based Access: The '520 patent teaches the concept of personalized access where user authentication determines which specific resources or services a user can access. Applying this to a remote control system (from '998) for "a plurality of user premises" would be a straightforward extension. A POSITA would be motivated to use the authentication data to identify which specific premises (and its associated gateway) the user is authorized to access, leveraging the personalized access taught by '520.
  • Establishing a "New Communication Session": The act of a user initiating a request via a browser, leading to the central server connecting to the remote gateway, would naturally involve establishing a communication session. The term "new" simply refers to a session initiated in response to the user's current request.
  • Storing Information and Single Authentication for Review: The '520 patent discloses user profiles and personalized data storage. The '998 patent involves monitoring, which generates data. Combining these, it would be obvious to a POSITA to store monitored "event information" or "surveillance data" (as described in '097) in the central network (e.g., an extranet as defined in '097) and associate it with the user's profile. The provision of accessing this stored data for "subsequent review by a user associated with the user premises, without requiring the user to provide the authentication data" during the same browser session is a well-known and desirable feature in web application security and user experience (e.g., single sign-on or session management), making it an obvious design choice for a personalized remote monitoring service. The initial authentication granting authority to access both live control and previously stored data is a logical and convenient extension of personalized access.

2. Combination of U.S. Patent 6,144,998, U.S. Patent 5,850,520, and U.S. Patent 6,292,834 (Persistent network connection).

• Motivation for Combination: While the first combination addresses many aspects, a common challenge for remote access to home devices is that the premises network or its local gateway might not have a persistently active or publicly routable IP address. A POSITA seeking to build a robust remote access system would recognize this and be motivated to incorporate solutions for establishing on-demand connections to such intermittently connected or dynamically addressed remote endpoints. U.S. Patent 6,292,834 (the '834 patent) directly addresses this problem by teaching a "rendezvous server" that facilitates establishing connections to local devices from a wide area network.

• Obviousness Argument:

  • All arguments from Combination 1 apply.
  • "Second hardware processing circuitry configured to communicate on-demand with the connection gateway" and "establishing a new communication session": The '834 patent's "rendezvous server" performs a function analogous to a component within the '097 patent's "second hardware processing circuitry" (e.g., the communications server within the extranet). It maintains current connection information for a local device and facilitates the establishment of a connection to it. Applying this teaching to the '998 system, the central "control server" would consult an '834-like rendezvous mechanism to initiate an "on-demand" connection to the premises gateway when a user requests access to their property. This directly addresses the '097 patent's description of the "user premises network... normally in an unconnected state in relation to the provider network" and the "service node... instruct[ing] a communications server... to initiate a connection to the gateway." The establishment of a "new communication session" upon verification of authentication data would be a direct implementation of these combined teachings.

Conclusion on Obviousness

The independent claims of U.S. Patent 9,961,097, which describe a system for remote premises access involving a user's browser, an external network with a communications server, and a premises gateway, appear to be obvious when viewed through the lens of the cited prior art and common engineering principles available at the time of the invention. The combination of web-based remote control (from '998), personalized and authenticated access to resources (from '520), and mechanisms for establishing on-demand connections to intermittently available remote networks (from '834), would have naturally led a POSITA to the claimed invention. The specific architectural choices, such as using a premises gateway as a hub and enabling single authentication for both live and stored data, represent obvious design implementations to enhance convenience, security, and scalability in such a system.