Capture: Amazon's worker-tracking wristband patent numbers and mechanism, confirmed against the USPTO primary

This capture directly answers the open question logged at question-verify-amazon-wristband-patents-uspto, which flagged that claim-amazon-2018-worker-tracking-wristband-patents rested on NPR's secondary reporting with the patent numbers only "relayed through the capture, not confirmed against USPTO." That note's 2026-07-10 audit already did a first confirmation pass against Google Patents; this session re-pulled both patents directly and captured verbatim text with full provenance, closing the quant/mechanism gap on a Tier-1 footing.

Both patents were fetched at patents.google.com/patent/US9881276 and .../US9881277 — URLs verified live (non-404, content returned) during this session. Google Patents is treated as a primary-document mirror here, not an editorial secondary source: the page reproduces the patent's own front-matter (title, assignee, filing/grant dates) and body text (abstract, claims, description) as granted by USPTO, which is the standard practical route to a USPTO grant's full text. This matches how the existing claim-note's own prior audit sourced the same patents.

Claim: US 9,881,276 B2 ("Ultrasonic bracelet and receiver for detecting position in 2D plane") and US 9,881,277 B2 ("Wrist band haptic feedback system") are both assigned to Amazon Technologies, Inc., filed 2016-03-28, and granted 2018-01-30

Claim type: quantitative (patent numbers, kind codes, filing/grant dates) — Tier 1–2 required, achieved Tier 1.

Both patent pages independently returned matching assignee and date fields. For US 9,881,276:

"Patent Number: US9881276B2 ... Assignee: Amazon Technologies Inc ... Filing Date: March 28, 2016 ... Grant Date: January 30, 2018."

For US 9,881,277:

"Patent Number: US9881277B2 ... Assignee: Amazon Technologies Inc ... Filing Date: March 28, 2016 ... Publication/Grant Date: January 30, 2018."

This corrects and sharpens the prior claim-note's audit, which recorded "US 9,881,276" and "US 9,881,277" without a kind code — both are confirmed here as B2 grants, and both share the same filing date (2016-03-28), a detail absent from the prior note.

Provenance:

• source_url: https://patents.google.com/patent/US9881276 ; https://patents.google.com/patent/US9881277
• source_author: USPTO grant text, assignee Amazon Technologies, Inc. (accessed via Google Patents mirror)
• source_date: filed 2016-03-28, granted 2018-01-30 (both patents)
• source_tier: 1
• exact quotes: as above, extracted directly from each patent's Google Patents page during this session

Claim: US 9,881,276's mechanism is ultrasonic time-of-arrival tracking — a worker-worn "ultrasonic unit" periodically emits ultrasonic pulses that fixed transducers near inventory bins detect and process to locate the worker's hand, with a haptic feedback mechanism built into the same wearable

Claim type: specific technical-mechanism claim — Tier 1–2 required, achieved Tier 1.

"Ultrasonic tracking of a worker's hands may be used to monitor performance of assigned tasks. An inventory system includes inventory bins configured to store inventory items, an ultrasonic unit, ultrasonic transducers, and a management module." — abstract, US 9,881,276

"Ultrasonic transducers are arranged relative to inventory bins and generate signals that are processed to track the location of the ultrasonic pulse emitting units relative to the inventory bins." — description, US 9,881,276

"[E]ach of the ultrasonic units" is equipped with "a haptic feedback mechanism that is controlled to provide suitable haptic feedback to the worker." — description, US 9,881,276

The wearable's ultrasonic unit emits pulses at a stated cadence ("once per second" per the fetched extraction) and a management module compares arrival times across multiple fixed receivers to "determine and track location of the ultrasonic unit." This is a distinct mechanism from US 9,881,277 below — the two patents split radio-frequency and ultrasonic approaches rather than describing the same system twice, matching the prior note's 2026-07-10 correction.

Provenance:

• source_url: https://patents.google.com/patent/US9881276
• source_author: USPTO grant text, assignee Amazon Technologies, Inc. (accessed via Google Patents mirror)
• source_date: granted 2018-01-30
• source_tier: 1
• exact quotes: as above. Note: a second confirmatory fetch attempting to pull the full verbatim abstract paragraph in one pass could not complete this session due to repeated Claude API 529 (overload) errors on the fetch tool; the quotes above come from a single successful extraction pass and were not independently cross-checked twice within this session the way US 9,881,277's abstract was (see next claim). Treat as high-confidence but not double-verified.

Claim: US 9,881,277's mechanism is radio-frequency time-of-flight tracking — fixed RF antennas transmit interrogation signals, a worker-worn RF transceiver replies, and a management module processes response timing to locate the worker's hand and identify the nearest inventory bin, with the same wearable also carrying a haptic feedback mechanism and a motion-detection unit for hand-gesture input

Claim type: specific technical-mechanism claim — Tier 1–2 required, achieved Tier 1.

Full verbatim abstract, confirmed in a single clean extraction pass:

"Inventory management systems and related methods employ radio frequency based tracking of a worker's hands to monitor performance of inventory tasks. An inventory management system includes inventory bins, a user-wearable unit configured to be worn in proximity to a user's hand, fixed RF antennas configured to transmit at least one RF interrogation signal and receive at least one RF response signal, a RF transceiver operatively coupled with the fixed RF antennas, and a management module operatively coupled with the RF transceiver. The user-wearable unit includes an RF transceiver configured to transmit RF response signals in response to reception of the at least one RF interrogation signal. The management module is configured to process signals generated by the RF transceiver to track locations of the user-wearable unit and identify an inventory bin based on proximity of the user-wearable unit to the identified inventory bin to monitor performance of an inventory system task." — abstract, US 9,881,277

Supporting mechanism detail from the description:

Location is determined using "time of flight of interrogation signals from and back to respective RF antennas."

The management module controls "operation of a haptic feedback mechanism ... to communicate a haptic feedback to the user indicating whether the identified inventory bin matches a designated inventory bin."

The wearable includes "a motion detection unit configured to generate data that can be processed to track orientation" and detect user commands through recognizable hand motions.

This confirms the mechanism split described in the prior note's 2026-07-10 audit (NPR's "radio frequencies or ultrasonic pulses" maps onto two separate patents, not one system with two optional modes) and adds two details not previously captured: the RF patent's location method is specifically time-of-flight, and it independently includes a motion-detection unit for hand-gesture recognition, beyond the haptic-feedback overlap with US 9,881,276.

Provenance:

• source_url: https://patents.google.com/patent/US9881277
• source_author: USPTO grant text, assignee Amazon Technologies, Inc. (accessed via Google Patents mirror)
• source_date: granted 2018-01-30
• source_tier: 1
• exact quote: full abstract as above, extracted verbatim in a single targeted fetch pass ("return ONLY the exact verbatim text of the Abstract... do not paraphrase")

Central question status

Are Amazon's worker-tracking wristband patent numbers and mechanism confirmed against the USPTO primary? Yes — resolved. US 9,881,276 B2 ("Ultrasonic bracelet and receiver for detecting position in 2D plane") and US 9,881,277 B2 ("Wrist band haptic feedback system"), both Amazon Technologies, Inc., filed 2016-03-28 and granted 2018-01-30, are confirmed directly against their USPTO grant text (accessed via Google Patents). The mechanisms are confirmed as genuinely distinct and complementary rather than duplicative: '276 uses ultrasonic time-of-arrival tracking with an onboard haptic feedback mechanism; '277 uses RF time-of-flight tracking with its own haptic feedback mechanism plus a motion-detection unit for gesture input. This directly closes the "patent numbers and mechanism" half of question-verify-amazon-wristband-patents-uspto; the question's other half — a verbatim quote from the original NPR (2018-02-01) article — was not pursued this session and remains open.

Further leads

• The NPR verbatim-quote gap tracked on question-verify-amazon-wristband-patents-uspto and claim-amazon-2018-worker-tracking-wristband-patents is still unresolved; this capture did not re-fetch NPR.
• Both patents share an identical filing date (2016-03-28), nearly two years ahead of their shared grant date (2018-01-30) — worth checking whether Amazon filed other wearable hand-tracking patents the same day as part of a larger filing batch (not investigated this session).
• A WebSearch for post-2018 press/labor-advocacy reaction to the patents could not be completed this session due to repeated Claude API 529 (overload) errors on the search tool; a follow-up session could retry this to fill out reception/criticism context beyond what's already in claim-amazon-2018-worker-tracking-wristband-patents's commentary.
• Direct USPTO endpoints (Patent Public Search PDF download, pdfpiw.uspto.gov) were attempted and returned 403/404 without an authenticated session; Google Patents was the only reliably reachable primary-text mirror this session — worth knowing for future patent-verification captures.

Entity candidates

• Amazon Technologies, Inc. — organization — recurring patent assignee across the vault's labor-surveillance and wearables cluster; a dedicated entity page could anchor multiple claim-notes.
• US 9,881,276 B2 ("Ultrasonic bracelet and receiver for detecting position in 2D plane") — concept/term — a specific granted patent that could carry its own atomic claim-note distinct from the synthesis note it currently backs.
• US 9,881,277 B2 ("Wrist band haptic feedback system") — concept/term — same reasoning as above; the RF-tracking sibling patent.
• Google Patents (as a USPTO primary-text access route) — concept/term — came up as the only reliably reachable mirror for direct patent verification this session; may be worth a standing note on how Seek accesses primary patent text given how often patents recur as sources.