US3227581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for rendering ceramics slightly conductive
Assignee: Varian Medical Systems Inc
•
Filing: 1960-02-23
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Granted: 1966-01-04
•
Expires: 1980-02-23
Abstract
No abstract record available.
Inventors
- 👤 Frank J Zumaquero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:56
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5127; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C23; C23C; C23C14/00; C23C14/04; C23C14/046; C23C14/06; C23C14/14; C23C14/18; C04B2111/00; C04B2111/00474; C04B2111/00844; Y; Y10; Y10S; Y10S118/00; Y10S118/90; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/125; Y10T428/12514
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
THE PROCESS OF RENDERING A NORMALLY NON-CONDUCTIVE CERAMIC MATERIAL SEMI-CONDUCTIVE COMPRISING THE STEPS OF HEATING A CERAMIC COMPRISING ABOUT 94% ALUMINA IN A HYDROGEN ATMOSPHERE WHICH HAS A DEW POINT OF -80*C. OR LESS AND IN THE PRESENCE OF COPPER METAL TO A TEMPERATURE RANGING FROM 1040*C. TO 1060* C., SAID ATMOSPHERE BEING AT SUBSTANTIALLY ATMOSPHERIC PRESSURE, AND MAINTAINING SAID TEMPERATURE FOR AT LEAST APPROXIMATELY 15 MINUTES WHEREBY A CHEMICAL REACTION OCCURS BETWEEN SAID CERAMIC AND COPPER IMPREGNATING SAID CERAMIC WITH CONDUCTIVE PARTICLES AND RENDERING SAID CERAMIC WITH A SEMI-CONDUCTIVE SURFACE LAYER.
Claim 2
Dependent Claim
92 words
THE PROCESS OF RENDERING A NORMALLY NON-CONDUCTIVE CERAMIC MATERIAL SEMI-CONDUCTIVE COMPRISING THE STEPS OF HEATING A CERAMIC COMPRISING ABOUT 94% ALUMINA IN A HYDROGEN ATMOSPHERE WHICH HAS A DEW POINT OF -80*C. OR LESS AND IN THE PRESENCE OF COPPER METAL TO A TEMPERATURE RANGING FROM 1040*C. TO 1060* C., SAID ATMOSPHERE BEING AT SUBSTANTIALLY ATMOSPHERIC PRESSURE, AND MAINTAINING SAID TEMPERATURE FOR AT LEAST APPROXIMATELY 15 MINUTES WHEREBY A CHEMICAL REACTION OCCURS BETWEEN SAID CERAMIC AND COPPER IMPREGNATING SAID CERAMIC WITH CONDUCTIVE PARTICLES AND RENDERING SAID CERAMIC WITH A SEMI-CONDUCTIVE SURFACE LAYER.
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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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |