Patent US3543294A successfully refreshed from Google Patents.
Patent US2393938A successfully refreshed from Google Patents.
US2393938A
Expired / Lapsed
US
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Method of making selenium elements
Assignee: Federal Telephone and Radio Corp
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Filing: 1943-01-07
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Granted: 1946-01-29
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Expires: 1963-01-07
Abstract
No abstract record available.
Inventors
- 👤 Skinker Murray Fontaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:30
CPC Classifications
C; C11; C11D; C11D1/00; H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10P; H10P14/00; H10P14/20; H10P14/34; H10P14/3402
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) | 1949-01-28 | 1949-07-30 | 1950-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-01-28 | 1953-07-30 | 1954-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-01-28 | 1957-07-30 | 1958-01-29 | $7700.00 | Window Closed / Lapsed |