Patent US3577275A successfully refreshed from Google Patents.
US3577275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-conductor crystal supports
Assignee: Stackpole Carbon Co
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Filing: 1969-04-02
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Granted: 1971-05-04
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Expires: 1989-04-02
Abstract
Abstract SEMI-CONDUCTOR CRYSTAL SUPPORTS COMPRISING A BASE OF THE GROUP CONSISTING OF TUNGSTEN AND MOLYBDENUM ARE PREPARED BY OXIDIZING AT LEAST THE SURFACE OF THE BASE TO WHICH A CURRENT LEAD IS TO BE SOLDERED, COATING AT LEAST THAT SURFACE OF THE BASE WITH METAL OF THE GROUP CONSISTING OF SIVER AND COPPER, AND THEN SUBJECTING THE COATED BASE TO HYDROGEN OR OTHER REDUCING ATMOSPHERE AT A TEMPERATURE ABOVE THE MELTING POINT OF THE COATING METAL. PREFERABLY THE DENSITY OF THE BASE IS AT LEAST 93 PERCENT OF THEORETICAL.
Inventors
- 👤 John C Kosco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:52
CPC Classifications
H; H10; H10W; H10W72/00; H10W72/30; H10W72/071; H10W72/073; H10W72/07331; H10W72/07336; H10W72/351; H10W72/352
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |