Patents
US 10474851 B2: Systems and methods for collision avoidance in a multiple RFID interrogator environment
- Granted
- 2019-11-12
- Filed
- 2017-12-06 application 15833871
- Type
- Utility · 17 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A method for collision avoidance in a multi-reader environment comprising a plurality of Radio Frequency Identification (RFID) interrogators, the method comprises each of the plurality of interrogators entering a quiet state during which none of the interrogators transmits, each of the plurality of interrogators selecting a transmit time after the quiet period during which each of the interrogator will attempt to transmit, each of the plurality of interrogators monitoring their associated receive path, an interrogator of the plurality of interrogators transmitting an instruction during its selected transmit time indicating the beginning of a session when the interrogator does not detect data on its receive path prior to its select transmit time, the interrogator comparing its receive path to its transmit path when it transmits the instruction, the interrogator returning to the quiet state when the receive path does not match the transmit path, and the interrogator completing the session when the receive path matches the transmit path.
Source: PVGPATDIS, file of 2026-04-10 (ipg191112.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| SMARTRAC TECHNOLOGY FLETCHER, INC. 11 patents | US company or organization | Fletcher, NC | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Kirk Greefkes | Poway, CA | 4 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| G06K | Graphical data reading ; presentation of data; record carriers; handling record carriers | G06K7/10019 | PVGPATDIS, file of 2026-04-10 |
| H04W | Wireless communication networks | H04W74/085 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2018-06-07 | Assignment Assignment of assignor's interest | NEOLOGY, INC. signed 2018-05-11 SINGLE CHIP SYSTEMS CORP. signed 2018-05-11 | SMARTRAC TECHNOLOGY FLETCHER, INC. FLETCHER, NC | 46321/793 | PASDL, file of 2026-10-15 |
| 2018-02-14 | Assignment Assignment of assignor's interest | GREEFKES, KIRK signed 2008-09-10 | NEOLOGY, INC. POWAY, CA | 44933/139 | ECORSEXC, file of 2026-09-25 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.