Patent US2977193A successfully refreshed from Google Patents.
US2977193A
Expired / Lapsed
US
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Method of producing a dielectric material
Assignee: General Electric Co
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Filing: 1957-10-01
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Granted: 1961-03-28
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Expires: 1977-10-01
Abstract
No abstract record available.
Inventors
- 👤 Harold S Endicott
- 👤 George E Ledges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:34
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/025; C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/20; Y; Y10; Y10S; Y10S106/00; Y10S106/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF TREATING PHLOGOPITE MICA FOR USE AS A DIELECTRIC MATERIAL WHICH COMPRISES HEATING SAID MICA TO A TEMPERATURE BETWEEN ROOM TEMPERATURE AND 950*C., AND APPLYING SIMULTANEOUSLY TO SAID MICA A DIRECT VOLTAGE OF BETWEEN 200 VOLTS PER MIL AND 1000 VOLTS PER MIL FOR MICA TO A VALUE GREATER THAN THE RESISTANCE OF UNTREATED MICA UPON SUBSEQUENT HEATING THEREOF TO 600*C.
Claim 2
Independent Claim
63 words
A METHOD OF TREATING PHLOGOPITE MICA FOR USE AS A DIELECTRIC MATERIAL WHICH COMPRISES HEATING SAID MICA TO A TEMPERATURE BETWEEN ROOM TEMPERATURE AND 950*C., AND APPLYING SIMULTANEOUSLY TO SAID MICA A DIRECT VOLTAGE OF BETWEEN 200 VOLTS PER MIL AND 1000 VOLTS PER MIL FOR MICA TO A VALUE GREATER THAN THE RESISTANCE OF UNTREATED MICA UPON SUBSEQUENT HEATING THEREOF TO 600*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |