Patent US3520980A successfully refreshed from Google Patents.
US3520980A
Expired / Lapsed
US
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Crucible for heat treatment of conductive materials
Assignee: International Standard Electric Corp
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Filing: 1968-08-27
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Granted: 1970-07-21
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Expires: 1988-08-27
Abstract
No abstract record available.
Inventors
- 👤 Henley Frank Sterling
- 👤 Wilbert Ridd George
- 👤 Denis William John Hazelden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:32
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/10; F; F27; F27B; F27B14/00; F27B14/06; F27B14/061; F27B14/063; F27D; F27D11/00; F27D11/06; F27B14/04; F27M; F27M2001/00; F27M2001/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3461215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |