Patents
US 10133894 B2: Systems and methods for stirring electromagnetic fields and interrogating stationary RFID tags
- Granted
- 2018-11-20
- Filed
- 2010-12-30 application 12982398
- Type
- Utility · 14 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
RFID tags are used for many purpose including tracking RFID interrogators are used to retrieve information from tags. In many applications, RFID interrogators and RFID tags remain stationary during interrogation. Regions of low energy due to interference from either additional antenna or reflections from RFID tags and objects can impede or prohibit the reading of RFID tags residing in such regions. Stirring of the generated electromagnetic field is a method of moving around the regions of low energy, where tags can not be read, during the interrogation process. Mechanical stirring is accomplished by introducing a conductor into the electromagnetic field and moving it about in the field. Solid state stirring is accomplished by introducing a variable conductor into the field and varying the conductivity of the variable conductor. Mathematical stirring is accomplished by use of a plurality of antenna and controlling the phase difference between the antenna in a configuration known as phased antenna arrays.
Source: PVGPATDIS, file of 2026-04-10 (ipg181120.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 |
|---|---|---|---|---|
| James Robert Kruest | San Diego, CA | 25 | PVGPATDIS, file of 2026-04-10 | |
| Gary Bann | San Diego, CA | 8 | 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 | G06K7/10475 | PVGPATDIS, file of 2026-04-10 |
| G06Q | Information and communication technology [ict] specially adapted for administrative, commercial, financial, managerial or supervisory purposes; systems or methods specially adapted for administrative, commercial, financial, managerial or supervisory purposes, not otherwise provided for | G06Q10/08 | PVGPATDIS, file of 2026-04-10 |
| H04J | Multiplex communication | H04J3/0641 | PVGPATDIS, file of 2026-04-10 |
| H05K | Printed circuits; casings or constructional details of electric apparatus; manufacture of assemblages of electrical components | H05K1/02 | 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 |
| 2017-08-28 | Release of security interest Release of security interest | LAKESTAR SEMI INC. signed 2017-08-23 | NOVATEL WIRELESS, INC. SAN DIEGO, CA | 43417/574 | ECORSEXC, file of 2026-09-25 |
| 2017-05-12 | Security interest Security interest Security interest | ENFORA, INC. signed 2017-05-08 INSEEGO NORTH AMERICA, LLC F/K/A FEENEY WIRELESS, INC. signed 2017-05-08 NOVATEL WIRELESS, INC. signed 2017-05-08 | LAKESTAR SEMI INC. NEW YORK, NY | 42452/518 | ECORSEXC, file of 2026-09-25 |
| 2015-01-08 | Correction Corrective assignment to correct the assignee previously recorded on reel 025984 frame 0112. assignor(s) hereby confirms the assignee is neology, inc.. | KRUEST, JAMES ROBERT signed 2007-09-11 BANN, GARY signed 2007-10-09 | NEOLOGY, INC. POWAY, CA | 34745/585 | ECORSEXC, file of 2026-09-25 |
| 2011-03-18 | Assignment Assignment of assignor's interest | KRUEST, JAMES ROBERT signed 2007-09-11 BANN, GARY signed 2007-10-09 | NOVATEL WIRELESS, INC. POWAY, CA | 25984/112 | 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.