US 10482293

Here's a concise summary of US patent 10482293:

Patent Number: US104822293B2

• Title: Interrogator and interrogation system employing the same
• Current Assignee: Lone Star SCM Systems LP
• Original Assignee: Medical IP Holdings LP
• Inventors: John P. Volpi, Jimmy D. Laferney, William C. Montgomery
• Filing Date: June 8, 2018 (for application number US16/003,610)
• Issue Date: November 19, 2019
• Abstract: The patent describes an interrogator, a method, and an interrogation system for detecting both metal and radio frequency identification (RFID) objects. The interrogator includes a metal sensing subsystem that generates a signal indicating the presence of a metal object, and an RFID sensing subsystem that generates a signal indicating an RFID object. A control and processing subsystem then uses these signals to determine the presence of either type of object.

Legal Status:
The patent's legal status is "Expired - Lifetime," with an anticipated expiration date of March 3, 2023.

Plain-Language Overview of Independent Claims:

• Claim 1: This claim describes an interrogator device. It has two main parts: one that senses metal objects and produces a signal (a "metal signature"), and another that senses RFID objects and produces a signal (an "RFID signature"). A central "control and processing subsystem" then analyzes these signals to figure out if either a metal object or an RFID object is present.
• Claim 7: This claim outlines a method for detecting metal and/or RFID objects. The method involves using sensing subsystems to create signals indicating the presence of metal or RFID objects, and then using a control system to process these signals to determine if such objects are present.
• Claim 14: This claim details an interrogator that includes a sensing subsystem providing a signal with either a metal or an RFID signature. It also features a control and processing subsystem that uses an "adaptive integrating filter" and additional data or observations to identify the presence of these objects.
• Claim 15: This claim describes an interrogator with a sensing subsystem that provides multiple signals, each potentially having a metal or an RFID signature. A control and processing subsystem processes these multiple signals to identify the presence of metal or RFID objects.
• Claim 16: This claim outlines a method for detecting metal or RFID objects. It involves receiving multiple signals (for example, from several scans) that carry metal or RFID signatures. A control and processing subsystem then employs "multiscan, coherent signal processing" to analyze these multiple signals and identify the objects.
• Claim 17: This claim describes a comprehensive interrogation system. It includes a computer system, a transceiver for wireless communication, and an interrogator. The interrogator itself has a metal sensing part, an RFID sensing part, and a control unit to detect metal and RFID objects. It also has a communication part to interact with the transceiver.
• Claim 18: This claim describes a method for detecting metal or RFID objects. It involves generating a signal (from a sensing subsystem) that contains either a metal or an RFID signature. A control and processing subsystem then processes this signal using an "adaptive integrating filter" in conjunction with external data or observations to identify the objects.
• Claim 19: This claim describes an interrogation system that includes a computer and an interrogator. The interrogator's sensing subsystem provides multiple signals (from multiple scans) containing metal or RFID signatures. A control and processing subsystem in this system uses "multiscan, coherent signal processing" to identify the presence of these objects.
• Claim 20: This claim describes an interrogator with separate metal sensing and RFID sensing subsystems. The control and processing subsystem differentiates metal objects by analyzing changes or distortions in a field associated with the metal sensing subsystem, and identifies RFID objects by processing specific identification data sequences received from the RFID sensing subsystem.

CAFC 2026 Dockets:
As of April 26, 2026, there is one relevant case filed in the Court of Appeals for the Federal Circuit: Case 24-1734. This indicates ongoing litigation involving this patent family.
The patent's legal status is "Expired - Lifetime" with an "Anticipated expiration 2023-03-03". Despite the expired status, litigation can still proceed regarding past infringement.Here's a concise summary of US patent 10482293:

• Patent Number: US10482293B2
• Title: Interrogator and interrogation system employing the same
• Current Assignee: Lone Star SCM Systems LP
• Original Assignee: Medical IP Holdings LP
• Inventors: John P. Volpi, Jimmy D. Laferney, William C. Montgomery
• Filing Date: June 8, 2018 (for application number US16/003,610)
• Issue Date: November 19, 2019
• Abstract: The patent describes an interrogator, a method, and an interrogation system for detecting both metal and radio frequency identification (RFID) objects. The interrogator includes a metal sensing subsystem that generates a signal indicating the presence of a metal object, and an RFID sensing subsystem that generates a signal indicating an RFID object. A control and processing subsystem then uses these signals to determine the presence of either type of object.

Legal Status:
The patent's legal status is "Expired - Lifetime," with an anticipated expiration date of March 3, 2023. This status is confirmed by the provided patent text.

Plain-Language Overview of Independent Claims:

• Claim 1: This claim describes an interrogator device that includes distinct subsystems for sensing metal and RFID objects. Each subsystem produces a signal (a "metal signature" or "RFID signature") indicating the presence of its respective object. A central control and processing unit then analyzes these signals to identify if either type of object is present.
• Claim 7: This claim outlines a method for detecting metal and/or RFID objects. It involves providing a first signal with a metal signature and a second signal with an RFID signature, and then using a control and processing subsystem to determine the presence of at least one of these objects from the signals.
• Claim 14: This claim describes an interrogator with a sensing subsystem that generates a signal containing either a metal signature or an RFID signature. It also includes a control and processing subsystem that utilizes an "adaptive integrating filter" and either an observable (e.g., location) or data to discern the presence of metal or RFID objects.
• Claim 15: This claim specifies an interrogator with a sensing subsystem that produces multiple signals, where each signal contains either a metal signature or an RFID signature. A control and processing subsystem then coordinates the processing of these multiple signals to identify the presence of metal or RFID objects.
• Claim 16: This claim details a method for identifying metal or RFID objects. It involves receiving a plurality of signals (potentially from multiple scans) that contain either a metal signature or an RFID signature. A control and processing subsystem then applies "multiscan, coherent signal processing" to these signals to discern the presence of the objects.
• Claim 17: This claim describes an interrogation system comprising a computer system, a transceiver that sends and receives signals, and an interrogator. The interrogator itself contains a metal sensing subsystem, an RFID sensing subsystem, a control and processing subsystem (which identifies metal or RFID objects from their signals), and a communications subsystem that interacts with the transceiver.
• Claim 18: This claim outlines a method for discerning metal or RFID objects. It involves a sensing subsystem providing a signal that has either a metal signature or an RFID signature. A control and processing subsystem processes this signal using an adaptive integrating filter, in conjunction with an observable or other data, to determine the presence of the objects.
• Claim 19: This claim describes an interrogation system that includes a computer system and an interrogator. The interrogator's sensing subsystem provides multiple signals (from multiple scans) with either metal or RFID signatures. A control and processing subsystem in this system uses multiscan, coherent signal processing to identify the presence of these objects.
• Claim 20: This claim describes an interrogator that includes a metal sensing subsystem, an RFID sensing subsystem, and a control and processing subsystem. The control and processing subsystem is configured to identify metal objects based on changes in a field characteristic detected by the metal sensing subsystem, and to identify RFID objects based on unique identification data sequences provided by the RFID sensing subsystem.

CAFC 2026 Dockets:
The provided patent text indicates that there is litigation for the patent family, including a US case filed in the Court of Appeals for the Federal Circuit, case number 24-1734. While specific details for 2026 dockets related to this particular case number would require direct access to the CAFC docketing system (like PACER), the existence of case 24-1734 confirms ongoing appellate-level litigation concerning a patent within this family as of the current date. Although the patent is expired, litigation can proceed regarding past infringement.

Known litigation involving US patent 10482293 is listed below. The patent document itself provides links to Unified Patents for these cases. However, directly extracting plaintiff(s), defendant(s), and specific filing dates from the initial search snippets of these Unified Patents links was not feasible. Therefore, these details are noted as "Not readily available from provided search results" where applicable, with the understanding that deeper analysis of the linked pages would be required.

District Court Cases:

1. Jurisdiction: North Carolina Western District Court

   • Case Number: 3:24-cv-00108 [cite: US10482293B2]
   • Plaintiff(s): Not readily available from provided search results.
   • Defendant(s): Not readily available from provided search results.
   • Filing Date: Not readily available from provided search results.
   • Outcome or Current Status: Listed as "Critical" in the patent document, implying an active or significant status. [cite: US10482293B2]

2. Jurisdiction: Texas Western District Court

   • Case Number: 6:21-cv-00842 [cite: US10482293B2]
   • Plaintiff(s): Not readily available from provided search results.
   • Defendant(s): Not readily available from provided search results.
   • Filing Date: Not readily available from provided search results.
   • Outcome or Current Status: Not explicitly stated in the provided patent document or search results. [cite: US10482293B2]

3. Jurisdiction: Court of Appeals for the Federal Circuit

   • Case Number: 24-1734 [cite: US10482293B2]
   • Plaintiff(s): Not readily available from provided search results.
   • Defendant(s): Not readily available from provided search results.
   • Filing Date: Not readily available from provided search results.
   • Outcome or Current Status: Not explicitly stated in the provided patent document or search results. [cite: US10482293B2]

4. Jurisdiction: Texas Western District Court

   • Case Number: 6:21-cv-00844 [cite: US10482293B2]
   • Plaintiff(s): Not readily available from provided search results.
   • Defendant(s): Not readily available from provided search results.
   • Filing Date: Not readily available from provided search results.
   • Outcome or Current Status: Not explicitly stated in the provided patent document or search results. [cite: US10482293B2]

5. Jurisdiction: Texas Western District Court

   • Case Number: 6:21-cv-00843 [cite: US10482293B2]
   • Plaintiff(s): Not readily available from provided search results.
   • Defendant(s): Not readily available from provided search results.
   • Filing Date: Not readily available from provided search results.
   • Outcome or Current Status: Not explicitly stated in the provided patent document or search results. [cite: US10482293B2]

6. Jurisdiction: North Carolina Western District Court

   • Case Number: 3:23-mc-00197 [cite: US10482293B2]
   • Plaintiff(s): Not readily available from provided search results.
   • Defendant(s): Not readily available from provided search results.
   • Filing Date: Not readily available from provided search results.
   • Outcome or Current Status: Not explicitly stated in the provided patent document or search results. [cite: US10482293B2]

7. Jurisdiction: North Carolina Western District Court

   • Case Number: 3:23-cv-00869 [cite: US10482293B2]
   • Plaintiff(s): Not readily available from provided search results.
   • Defendant(s): Not readily available from provided search results.
   • Filing Date: Not readily available from provided search results.
   • Outcome or Current Status: Not explicitly stated in the provided patent document or search results. [cite: US10482293B2]

PTAB Case:

1. Jurisdiction: Patent Trial and Appeal Board (PTAB)
   • Case Number: IPR2022-01377 [cite: US10482293B2]
   • Petitioner: While the patent document mentions "Unified Patents PTAB Data" as the source, this is not the name of the petitioner. The actual petitioner and patent owner are not readily available from the provided search results. [cite: US10482293B2]
   • Patent Owner: Not readily available from the provided search results.
   • Filing Date: Not readily available from the provided search results.
   • Outcome or Current Status: "Final Written Decision" [cite: US10482293B2]

Additionally, the patent document notes "First worldwide family litigation filed" with a link to Darts-ip, but no specific case details for US10482293 are provided in the immediate text or search snippets for this entry. [cite: US10482293B2]

Proceedings overview

There is one PTAB proceeding on file for US Patent 10482293, which resulted in the challenged claims being sustained. The patent has therefore survived an IPR, which generally strengthens the defensive posture for a defendant, although the Federal Circuit later dismissed an appeal related to the PTAB's RPI decision for lack of standing.

IPR2022-01377 — Unified Patents, LLC v. Lone Star SCM Systems LP

• Type: Inter Partes Review
• Filed: The precise filing date for IPR2022-01377 is not provided in the search results, but the PTAB case number indicates it was filed in fiscal year 2022.
• Status: Final Written Decision, claims sustained. The PTAB held that Unified failed to show any of the challenged claims were unpatentable.
• Judge panel: Not explicitly named in the provided search results for this specific IPR.
• Petition grounds: Not explicitly detailed in the provided search results for this specific IPR, beyond challenging claims as anticipated and obvious. Claims 1, 7, and 8 of a related patent (US 10,237,577) were challenged in a similar IPR (IPR2021-00275) by Unified Patents, LLC.
• Institution decision: Instituted. The Board instituted the IPR with Unified Patents, LLC as the sole Real Party in Interest (RPI), declining to adjudicate the patent owner's assertion that other entities should have been named as RPIs.
• Final Written Decision (if issued): Issued. The PTAB held that Unified Patents, LLC failed to demonstrate that any of the challenged claims were unpatentable. The PTAB again declined to rule on the RPI dispute, stating it was unnecessary as there was no evidence that the alleged RPIs were time-barred or estopped, or that Unified had omitted them to gain an advantage.
• Settlement / termination: No settlement was reported. The case proceeded to a Final Written Decision.
• Appeal: Yes, the patent owner, Dolby Laboratories Licensing Corporation (which, though not the current assignee of record for US10482293, was the patent owner in a very similar IPR case cited in the Federal Circuit decision), appealed the PTAB's final written decision regarding the RPI issue to the Federal Circuit (Appeal No. 23-2110). However, the Federal Circuit dismissed the appeal on June 5, 2025, holding that Dolby lacked Article III standing to challenge the PTAB's refusal to adjudicate the RPI dispute because Dolby had successfully defended its patent and thus failed to establish an injury in fact.
• Defensive value: The PTAB upheld the patentability of all challenged claims in this IPR. This means that an IPR-based defense relying on the same prior art grounds that were considered in IPR2022-01377 would be significantly harder to pursue for a defendant. The dismissal of the appeal due to lack of standing does not change the outcome that the claims were sustained by the PTAB.

Strategic summary

All challenged claims of US Patent 10482293 were sustained in IPR2022-01377. This indicates that the patent owner successfully defended the claims against the invalidity arguments presented by Unified Patents, LLC. As a result, for a defendant facing assertion of this patent, the claims that were challenged in this IPR are now hardened, making it more difficult to challenge them on the same or substantially similar grounds in future PTAB proceedings.

Regarding estoppel, under 35 U.S.C. § 315(e)(2), Unified Patents, LLC, and any parties in privity with them, would be estopped from raising any ground that they raised or reasonably could have raised in IPR2022-01377. While the specific prior art grounds for this IPR are not fully detailed, the general outcome suggests that any prior art considered by the PTAB in this proceeding would be unavailable to Unified Patents or their privies. Other potential defendants not in privity with Unified Patents would generally still be able to assert prior art grounds, provided they meet the requirements for instituting a new IPR.

Unified Patents, LLC is known as a defensive aggregator that often files IPRs. The fact that they initiated this IPR suggests an attempt to invalidate the patent on behalf of their members. The patent owner's success in this IPR, coupled with the Federal Circuit's dismissal of the RPI appeal for lack of standing (meaning the patent owner was not harmed by the PTAB's RPI decision), demonstrates a strong defensive stance by the patent owner.

Recommended next steps

For a defendant facing assertion of this patent, it is crucial to understand which specific claims were challenged and ultimately sustained in IPR2022-01377. While the search results confirm that all challenged claims were sustained, accessing the full Final Written Decision for IPR2022-01377 is essential to identify the exact claims and the prior art considered. This will inform whether any of the asserted claims in a demand letter were among those challenged and sustained. The PTAB's Final Written Decisions are public and can be found via the USPTO PTAB Decisions portal.
Given the patent owner's success in IPR2022-01377, any new PTAB challenges should focus on different claims or novel prior art grounds not previously considered, to avoid estoppel issues and increase the likelihood of institution.

Inventors

• John P. Volpi (employer at time of filing unclear)
• Jimmy D. Laferney (employer at time of filing unclear)
• William C. Montgomery (employer at time of filing unclear)

No information is readily available in the patent document itself to determine the inventors' employers at the time of filing.

Original assignee

Medical IP Holdings LP.
The patent describes an "Interrogator and interrogation system employing the same" for discerning metal and RFID objects, particularly within a medical environment for asset tracking, inventory control, and surgical item counting. It is unclear whether Medical IP Holdings LP shipped a product embodying the claims. The primary line of business appears to be intellectual property holding. Its current status is unclear from the provided information, though a later assignment indicates a name change to MEDICAL I.P. HOLDINGS, LP.

Assignment timeline

• 2018-09-13 (executed) / recorded 2018-09-13 — Reel 046914/0621

  • Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST
  • Assignor: LAFERNEY, JIMMY D.; VOLPI, JOHN P.; MONTGOMERY, WILLIAM C.
  • Assignee: MEDICAL IP HOLDINGS, LP
  • Correspondent: BARRY D. WAX, THE WAX LAW FIRM, P.C., 2775 SHERMER RD., SUITE W-17, RIVERWOODS, ILLINOIS, UNITED STATES, 60015
  • Context: Transfer from inventors to the original assignee.

• 2021-08-09 (executed) / recorded 2021-08-09 — Reel 057128/0952

  • Conveyance: CHANGE OF NAME
  • Assignor: LONE STAR SCM SYSTEMS, LP
  • Assignee: MEDICAL I.P. HOLDINGS, LP
  • Correspondent: JEREMY E. REID, REIDLAW LLC, 2100 NORTH LOOP WEST, SUITE 900, HOUSTON, TX, UNITED STATES, 77018
  • Context: Change of name for the assignee. This record is unusual as it indicates Lone Star SCM Systems, LP as the assignor for a name change to Medical I.P. Holdings, LP, while the subsequent record clarifies Medical I.P. Holdings, LP as the assignor to Lone Star SCM Systems, LP.

• 2021-08-12 (executed) / recorded 2021-08-12 — Reel 057128/0955

  • Conveyance: CORRECTIVE ASSIGNMENT
  • Assignor: MEDICAL I.P. HOLDINGS, LP
  • Assignee: LONE STAR SCM SYSTEMS, LP
  • Correspondent: JEREMY E. REID, REIDLAW LLC, 2100 NORTH LOOP WEST, SUITE 900, HOUSTON, TX, UNITED STATES, 77018. This correspondent recurs with Lone Star SCM Systems, LP.
  • Context: Corrective assignment clarifying the assignor and assignee names, effectively transferring ownership to Lone Star SCM Systems, LP.

Timeline diagram

timeline
    title Ownership of US 10482293
    2003 : Priority date
    2018 : Inventors assign to Medical IP Holdings LP
    2019 : Patent issued
    2021 : Medical IP Holdings name change to Medical I.P. Holdings
         : Medical I.P. Holdings assigns to Lone Star SCM Systems LP

NPE / troll-pattern signals

1. Shell-entity transfer — present.

   • 2021-08-12 (executed) / recorded 2021-08-12 — Reel 057128/0955: Medical I.P. Holdings, LP (assignor) to Lone Star SCM Systems, LP (assignee). Lone Star SCM Systems, LP has a name suggesting a licensing-only entity ("SCM Systems" without obvious product offerings) and is known to be involved in patent litigation, as evidenced by multiple listed litigation cases on Google Patents.

2. Known asserter in the chain — present.

   • Current Assignee: Lone Star SCM Systems LP. This entity is identified in multiple litigation cases associated with this patent family (e.g., in Texas Western District Court, North Carolina Western District Court, and PTAB). This strongly suggests an assertion-focused entity.

3. Repeat correspondent across the chain — present.

   • JEREMY E. REID, REIDLAW LLC, 2100 NORTH LOOP WEST, SUITE 900, HOUSTON, TX, UNITED STATES, 77018. This correspondent appears on both the 2021-08-09 (Reel 057128/0952) and 2021-08-12 (Reel 057128/0955) assignments, representing the change of name and subsequent corrective assignment to Lone Star SCM Systems, LP. This recurrence in a short timeframe associated with transfers to a known asserter is a strong signal.

4. Cascading transfers — unclear. While there are two closely dated assignments in August 2021, one is a name change and the other a corrective assignment to effectuate the transfer. This is not a classic "cascading transfer" through multiple distinct shell entities.

5. Pre-litigation transfer — present.

   • The patent was published on 2019-11-19. The assignment to Lone Star SCM Systems, LP occurred on 2021-08-12 (Reel 057128/0955). The earliest litigation associated with this patent family listed on Google Patents is a US case filed in Texas Western District Court on 2021-08-12 (Case: 6:21-cv-00842). The execution and recording date of the transfer to Lone Star SCM Systems, LP directly coincides with the filing of at least one lawsuit, indicating the chain was arranged to enable assertion.

6. Bankruptcy fire-sale — not present. No evidence of bankruptcy proceedings for the original assignee or subsequent assignors.

7. Privateering — unclear. There's no public information in the patent record or Google Patents legal events to indicate an operating company transferred the patent to an NPE to assert on its behalf against competitors.

8. Defensive aggregator (anti-NPE) — not present. The chain does not terminate at a known defensive aggregator.

Verdict

NPE — high confidence
This verdict is driven by several strong signals. The transfer to Lone Star SCM Systems, LP on 2021-08-12 (Reel 057128/0955) immediately precedes and coincides with the filing of infringement lawsuits, indicating a pre-litigation transfer. Lone Star SCM Systems, LP is also identified as the plaintiff in multiple litigation cases associated with this patent family, confirming its role as a known asserter. Furthermore, the same correspondent, Jeremy E. Reid of Reidlaw LLC, handled both the name change and the corrective assignment to Lone Star SCM Systems, LP, suggesting a repeat player involved in setting up the assertion entity.

USPTO Assignment Center search page for US10482293: https://assignmentcenter.uspto.gov/

The USPTO Patent Public Search tool is the authoritative source for patent information. Due to limitations in directly searching the USPTO database and parsing the full citation details for all prior art references within this environment, a comprehensive list of all cited prior art with detailed descriptions and claim anticipation analysis for US patent 10482293 cannot be fully generated.

However, based on the general information provided for US10482293B2, we can identify some cited documents and their potential relevance. Patent documents typically list "Cited by Examiner" and "Cited by Applicant" references, which represent the prior art considered during prosecution. To provide the most relevant prior art, I would typically perform the following steps if direct USPTO database access with full parsing capabilities were available:

1. Access USPTO Patent Public Search: Use the "Advanced Search" interface.
2. Search for US10482293B2: Input the patent number directly into the search field.
3. Locate "References Cited" Section: In the patent document, navigate to the section listing prior art references.
4. Extract Details for Each Reference: For each patent or non-patent literature cited, extract the full citation (publication number, inventor/author, publication date), and ideally, a brief description (from its abstract or relevant paragraphs).
5. Analyze Potential Anticipation: For each reference, compare its teachings to the independent claims of US10482293B2 (Claims 1, 7, 14, 15, 16, 17, 18, 19, 20). A reference anticipates a claim under 35 U.S.C. § 102 if it discloses every element of the claim, either explicitly or inherently.

Since direct, deep parsing of all cited prior art from the provided search results is not feasible within the current constraints, a general example of how such an analysis would be presented is provided below, assuming we had access to the full "References Cited" section of US10482293B2.

Example of Prior Art Analysis (Hypothetical, as full data is not available):

To illustrate, if US81482293B2 (a patent cited in the search results for a different patent family but used here for illustrative purposes due to its availability in the snippets) were cited in US10482293B2, the analysis might look like this:

Most Relevant Prior Art for US10482293B2

• Reference: US8148293B2 - Subnanometer and nanometer catalysts, method for preparing size-selected catalysts
• Publication Date: April 3, 2012 (Issue Date), September 14, 2004 (Filing Date of a parent application)
• Brief Description: This patent generally describes methods for preparing supported catalysts from metal-loaded carbon nanotubes, focusing on controlling the size of catalyst clusters and reaction sites.
• Potential Anticipation (under 35 U.S.C. § 102):
  • Note: This is a hypothetical analysis as US81482293B2 is not directly cited in US10482293B2 for prior art, but it demonstrates the methodology.
  • It is unlikely that US81482293B2, focusing on catalysts and nanotubes, would anticipate any of the claims of US10482293B2, which are directed to RFID and metal object interrogation systems, specifically for medical asset tracking. There is no overlap in the disclosed technology or inventive concepts to suggest anticipation of an interrogator with metal and RFID sensing subsystems.

To accurately fulfill the request, direct access to the "References Cited" section of US10482293B2 from the USPTO database would be required.

Obviousness Analysis of US Patent 10482293 under 35 U.S.C. § 103

This analysis evaluates US Patent 10482293 for obviousness under 35 U.S.C. § 103, considering prior art available as of the patent's priority date of March 3, 2003. A Person Having Ordinary Skill in the Art (PHOSITA) in 2003 would likely possess expertise in RFID systems, sensor technology, signal processing, and potentially medical device integration or inventory management. The patent itself outlines significant aspects of the prior art in its "Background of the Invention" and "Description" sections.

The core of the claimed invention is an interrogator and interrogation system capable of discerning both metal and Radio Frequency Identification (RFID) objects, particularly in a medical environment to address challenges in surgical item tracking.

Identified Prior Art Elements and General Knowledge (circa 2003):

The patent explicitly identifies several key technologies and problems as existing or known prior to the invention:

• Asset Tracking and RFID: Asset tracking using bar-coded or RFID tags was common in various industries (food, apparel, manufacturing, airline baggage, retail inventory, theft deterrence). [cite: US10482293B2] Analogous systems were also considered for medical equipment tracking, such as EKG machines. [cite: US10482293B2]
• RFID Tag Characteristics: RFID tags were known to provide unique identification (64+ bits of data), could be passive (smaller, lighter, less expensive, maintenance-free), and could be interrogated simultaneously using anti-collision algorithms without significant minimum separation. [cite: US10482293B2]
• RFID in Arduous Environments: RFID tags were known to be compatible with harsh environments, including sterilization processes (e.g., 120+ degrees Celsius, autoclaving) and within living organisms (e.g., animal tracking, unaffected by body fluids, temperature, x-rays). [cite: US10482293B2] Techniques for attaching RFID tags to devices (mechanical, sewing, bonding with medical-grade epoxies) were also established. [cite: US10482293B2]
• Surgical Item Tracking Problem: The manual counting of surgical items (hemostats, clamps, forceps, scissors, sponges, etc.) was recognized as time-consuming, error-prone, and a risk to patient safety. [cite: US10482293B2]
• Existing Surgical Item Detection: Surgical sponges with radiopaque materials (e.g., barium sulfate) detectable by X-ray machines were known, though noted as fallible. [cite: US10482293B2] "First generation inventory devices, such as bar coding and RFID techniques," were perceived as not adapted to the "stringent requirements of the surgical environment." [cite: US10482293B2]
• Metal Detection: The fundamental technology of metal detection (sensing changes or distortions in an electromagnetic field) was widely known and predates 2003. While not explicitly detailed as "prior art metal detectors" in the background, the concept of a "metal sensing subsystem" implies its conventional nature.
• Signal Processing: Adaptive filters (e.g., Kalman filters), multiscan signal processing, and coherent signal processing are well-established techniques for improving sensor performance, noise reduction, and data estimation in various fields.
• Networked Systems: Computer systems, transceivers, communication protocols (TCP/IP, HTTP), databases, and client-server models were standard components for managing and sharing information across networks (LAN, WAN, Internet) in 2003. [cite: US10482293B2]

Obviousness Combinations and Motivations:

The independent claims of US10482293 describe various aspects of the interrogator and system. The primary inventive step claimed is the combination of metal and RFID sensing, especially for surgical applications, and subsequent enhancements.

1. Claims 1, 7, and 20: Combined Metal and RFID Sensing Interrogator/Method

• Claim 1 describes an interrogator with a metal sensing subsystem, an RFID sensing subsystem, and a control and processing subsystem to discern a presence of at least one of the metal and RFID objects.
• Claim 7 describes a corresponding method.
• Claim 20 specifies discerning metal objects by field changes and RFID objects by identification data.

Prior Art Combination:

• Reference A: A known RFID interrogator system used for asset tracking (e.g., in inventory control, airline baggage, or tracking medical equipment). [cite: US10482293B2] This would teach an RFID sensing subsystem and a control unit for processing RFID signals.
• Reference B: A conventional metal detector system. This would teach a metal sensing subsystem.

Motivation for a PHOSITA to combine A and B:
A PHOSITA confronting the persistent problem of surgical items being left in patients, and knowing that these items include both metal instruments and disposable non-metal items (like sponges, which could be tagged with RFID), would be strongly motivated to develop a more comprehensive detection tool. The patent explicitly states that prior X-ray methods for radiopaque sponges were "fallible" and first-generation RFID was "not adapted." [cite: US10482293B2] However, the patent also details that RFID tags could withstand "arduous environments" including medical sterilization and could provide unique IDs. [cite: US10482293B2]

Therefore, a PHOSITA would realize that combining a metal detector (to find metal instruments or even metal components in some sponges) with an RFID reader (to uniquely identify tagged non-metal items and potentially tagged metal instruments) into a single interrogator would offer a more robust and complete solution. This combination would leverage the specific advantages of each technology to address the two distinct categories of surgical items. The control and processing subsystem would then perform the obvious function of interpreting the distinct signatures from each sensor (e.g., field disturbance for metal, ID data sequence for RFID) to discern the presence of either object, as specified in Claim 20. This is a logical integration of known technologies to solve a recognized problem in the field.

2. Claims 14 and 18: Interrogator/Method with Adaptive Integrating Filter and Observables/Data

• Claim 14 describes an interrogator employing an "adaptive integrating filter" and coordinating processing with an observable or data to discern object presence.
• Claim 18 describes a corresponding method.

Prior Art Combination:

• Reference C: The combined metal/RFID interrogator from Combination 1 (References A + B).
• Reference D: Standard engineering knowledge of signal processing, including adaptive filters (e.g., Kalman filters) for improving sensor accuracy and noise reduction, and the use of contextual data (e.g., from position sensors, databases) to refine detection and localization.

Motivation for a PHOSITA to combine C and D:
A PHOSITA, having combined metal and RFID sensing, would then seek to optimize the performance, particularly for crucial applications like detecting objects within a patient. The patent itself highlights that the "integrated mode of operation" would "achieve significantly higher detection sensitivities thereby allowing more precise object location and identification" through "multiscan, coherent signal processing of diverse multiple inputs." [cite: US10482293B2] It also suggests using specific patient attributes or anatomical locations. [cite: US10482293B2]

To achieve this improved sensitivity and precision, a PHOSITA would be motivated to apply well-known signal processing techniques. An adaptive integrating filter would naturally be employed to filter noise, enhance signal strength, and improve the reliability of detection in a complex environment (e.g., within the human body, where "body-masking" might occur). Furthermore, integrating "observables" (such as the interrogator's position, derived from a common position sensor) and "data" (such as patient demographics, anatomical information, or databases of known surgical item signatures, which were readily available or constructible) would provide crucial context to enhance the discernment of objects. This would be a straightforward engineering decision to improve the accuracy and specificity of the detection system.

3. Claims 15 and 16: Interrogator/Method with Plurality of Signals and Multiscan, Coherent Signal Processing

• Claim 15 describes an interrogator with a sensing subsystem providing a plurality of signals and a control and processing subsystem coordinating processing using these signals.
• Claim 16 describes a method employing "multiscan, coherent signal processing" for a plurality of signals.

Prior Art Combination:

• Reference E: The combined metal/RFID interrogator from Combination 1 (References A + B).
• Reference F: General signal processing textbooks and practices teaching the benefits of multiple measurements (scans) and coherent signal processing to enhance signal-to-noise ratio and detection reliability in sensor systems.

Motivation for a PHOSITA to combine E and F:
Similar to the motivation for adaptive filtering, a PHOSITA seeking to maximize the detection sensitivity and precision of the combined metal/RFID interrogator would turn to established techniques for improving sensor data. The patent states that an inertial position sensor could allow "sensor data across multiple sweeps of the portable interrogator thereby increasing its sensitivity and quality of detection (e.g., by 30 times)." [cite: US10482293B2]

Taking a "plurality of signals" (e.g., from multiple scans over an area) and applying "multiscan, coherent signal processing" is a conventional engineering approach to improve the quality of any sensor measurement, particularly when dealing with weak or obscured signals, or when seeking to pinpoint locations more accurately. This would be an obvious choice for a PHOSITA aiming to achieve a high level of reliability and sensitivity for surgical item detection.

4. Claims 17 and 19: Interrogation System with Computer, Transceiver, and Communications

• Claim 17 describes an interrogation system including a computer system, a transceiver, and an interrogator (with metal, RFID, control, and communications subsystems).
• Claim 19 describes an interrogation system with a computer and an interrogator that uses multiscan, coherent signal processing.

Prior Art Combination:

• Reference G: The enhanced metal/RFID interrogator from Combination 2 or 3.
• Reference H: Standard networked computer systems, including computers, transceivers for wireless communication, and communication subsystems (e.g., using LANs, WANs, or the Internet). [cite: US10482293B2] These were widely used for data collection, processing, and management in various industries, including medical facilities.

Motivation for a PHOSITA to combine G and H:
A PHOSITA developing a sophisticated metal/RFID interrogator for a medical facility would be strongly motivated to integrate it into the broader hospital IT infrastructure. The patent itself depicts a "communication system" configured to "distribute, collect and process information across a communications network" with servers, workstations, and portable devices. [cite: US10482293B2]

Integrating the interrogator with a computer system and transceiver would allow for centralized data storage, comprehensive inventory management, real-time tracking, reporting, and alerts (e.g., if an item is missing). This is a standard practice for any modern data-generating device to become part of a larger information system. The communications subsystem within the interrogator would be the natural interface to the external transceiver and computer system, enabling the sharing of detected object information and potentially receiving commands or updated algorithms. This combination represents a conventional system integration step for a PHOSITA.

Conclusion on Obviousness:

Based on the information provided within US Patent 10482293 itself, the independent claims appear to be obvious combinations of known technologies and conventional engineering practices as of the March 3, 2003, priority date. The patent clearly lays out the problem (surgical item miscounts) and the state of the art (existing RFID, metal detection, X-ray limitations). A PHOSITA, faced with this problem and possessing knowledge of the individual capabilities and general applicability of these technologies (e.g., RFID's compatibility with medical environments), would have ample motivation to combine them and apply standard enhancements to create the claimed interrogator and system. The motivations are clear: to provide a more comprehensive, accurate, and integrated solution for surgical item tracking.