Patent US1380981A successfully refreshed from Google Patents.
US1380981A
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Assignee: General Electric Co
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Filing: 1917-04-21
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Granted: 1921-06-07
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Expires: 1937-04-21
Abstract
No abstract record available.
Inventors
- 👤 Langmuir Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:50
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/08; B06B1/085; H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/24; H04R19/00
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) | 1924-06-06 | 1924-12-06 | 1925-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-06-06 | 1928-12-06 | 1929-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-06-06 | 1932-12-06 | 1933-06-07 | $7700.00 | Window Closed / Lapsed |