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Patent US3493404A successfully refreshed from Google Patents.
US3493404A
Expired / Lapsed
US
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Ceramic material
Assignee: Physical Sciences Corp
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Filing: 1964-06-22
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Granted: 1970-02-03
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Expires: 1984-06-22
Abstract
No abstract record available.
Inventors
- 👤 John Alfred Earl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:15
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0054; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB239349A
Cited
GB393907A
Cited
US3001881A
Cited
US2837487A
Cited
US3287095A
Cited
US3274006A
Cited
US3024121A
Cited
US3279932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |