US3138686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal switch device
Assignee: General Electric Co
•
Filing: 1961-02-01
•
Granted: 1964-06-23
•
Expires: 1981-02-01
Abstract
No abstract record available.
Inventors
- 👤 Stephan P Mitoff
- 👤 Robert H Pry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:57
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/022; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A THERMAL SWITCH DEVICE COMPRISING A PAIR OF ELECTRODES, A LEAD ATTACHED TO EACH OF SAID ELECTRODES, RESISTOR MATERIAL POSITIONED BETWEEN SAID ELECTRODES, SAID RESISTOR MATERIAL COMPRISING A SOLID, CRYSTALLINE INSULATING MATERIAL WITH A SPECIFIC MELTING POINT, AND FINELY DIVIDED, CONDUCTIVE MATERIAL CONCENTRATED AT THE GRAIN BOUNDARIES OF THE CRYSTALS OF SAID INSULATING MATERIAL, THE CRYSTALS OF SAID SOLID, CRYSTALLINE INSULATING MATERIAL EXCLUDING SAID FINELY DIVIDED, CONDUCTIVE MATERIAL UPON SOLIDIFICATION AND CONCENTRATING SAID CONDUCTIVE MATERIAL AT ITS GRAIN BOUNDARIES, AND AN INSULATING MEMBER ENCAPSULATING AT LEAST THE EDGES OF SAID DEVICE.
Claim 2
Dependent Claim
91 words
A THERMAL SWITCH DEVICE COMPRISING A PAIR OF ELECTRODES, A LEAD ATTACHED TO EACH OF SAID ELECTRODES, RESISTOR MATERIAL POSITIONED BETWEEN SAID ELECTRODES, SAID RESISTOR MATERIAL COMPRISING A SOLID, CRYSTALLINE INSULATING MATERIAL WITH A SPECIFIC MELTING POINT, AND FINELY DIVIDED, CONDUCTIVE MATERIAL CONCENTRATED AT THE GRAIN BOUNDARIES OF THE CRYSTALS OF SAID INSULATING MATERIAL, THE CRYSTALS OF SAID SOLID, CRYSTALLINE INSULATING MATERIAL EXCLUDING SAID FINELY DIVIDED, CONDUCTIVE MATERIAL UPON SOLIDIFICATION AND CONCENTRATING SAID CONDUCTIVE MATERIAL AT ITS GRAIN BOUNDARIES, AND AN INSULATING MEMBER ENCAPSULATING AT LEAST THE EDGES OF SAID DEVICE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |