Patents
US 7697263 B2: High-temperature dielectric materials and capacitors made therefrom
- Granted
- 2010-04-13
- Filed
- 2007-03-27 application 11691837
- Type
- Utility · 64 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A ceramic dielectric composition suitable for preparing capacitors for use in high-temperature service conditions is disclosed. The ceramic material and capacitors made from it exhibit unique and heretofore unrealizable properties including low variation in capacitance with voltage up to high fields, low variation in capacitance with temperature over a broad temperature range, retained high permittivity at temperatures up to 200° C. and beyond, low loss, low field-induced strain and adequate capacitance to retain performance at very low service temperatures. The material is based on sodium bismuth titanate (NBT) with selected additions of substituents and dopants to broaden and flatten its dielectric response, lower loss, lower strain, lower voltage coefficient and increase resistivity.
Source: PVGPATDIS, file of 2026-04-10 (ipg100413.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| ACTIVE SIGNAL TECHNOLOGIES, INC. 5 patents | US company or organization | Linthicum, MD | PVGPATDIS, file of 2026-04-10 | |
| Alfred University 3 patents | US company or organization | Alfred, NY | Alfred University College or university EXACT high confidence: identical full name and state ALFRED UNIVERSITY Federal lobbying client EXACT high confidence: identical full name and state ALFRED UNIVERSITY Nonprofit EXACT high confidence: identical full name and state | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Keith Bridger | Washington, DC | 3 | PVGPATDIS, file of 2026-04-10 | |
| Arthur V. Cooke | Baltimore, MD | 3 | PVGPATDIS, file of 2026-04-10 | |
| Walter A. Schulze | Alfred Station, NY | 1 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| H01G | Capacitors; capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices of the electrolytic type | H01G4/1227 | PVGPATDIS, file of 2026-04-10 |
| C04B | Lime, magnesia; slag; cements; compositions thereof, e.g. mortars, concrete or like building materials; artificial stone ; ceramics ; refractories; treatment of natural stone | C04B35/462 | PVGPATDIS, file of 2026-04-10 |
| H01C | Resistors | H01C7/025 | 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 |
|---|---|---|---|---|---|
| 2009-10-01 | Government interest Confirmatory license | ACTIVE SIGNAL TECHNOLOGIES signed 2009-07-22 | DEFENCE TREAT REDUCTION AGENCY FORT BELVOIR, VA | 23323/805 | ECORSEXC, file of 2026-09-25 |
| 2007-07-20 | Assignment Assignment of assignor's interest | SCHULZE, WALTER ARTHUR signed 2007-07-02 | ALFRED UNIVERSITY ALFRED, NY | 19584/247 | ECORSEXC, file of 2026-09-25 |
| 2007-07-20 | Assignment Assignment of assignor's interest | BRIDGER, KEITH signed 2007-07-02 COOKE, ARTHUR V. signed 2007-07-02 | ACTIVE SIGNAL TECHNOLOGIES, INC. LINTHICUM, MD | 19584/110 | 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.