Patent US2919057A successfully refreshed from Google Patents.
Patent US1558567A successfully refreshed from Google Patents.
US1558567A
Expired / Lapsed
US
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Aircraft landing platform
Assignee: Sperry Gyroscope Co Ltd
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Filing: 1922-09-27
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Granted: 1925-10-27
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Expires: 1942-09-27
Abstract
No abstract record available.
Inventors
- 👤 Alexander E Schein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:03
CPC Classifications
B; B63; B63B; B63B29/00; B63B29/02; B63B29/04; B63B29/12
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) | 1928-10-26 | 1929-04-27 | 1929-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-10-26 | 1933-04-27 | 1933-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-10-26 | 1937-04-27 | 1937-10-27 | $7700.00 | Window Closed / Lapsed |