US2647438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable headrest
Assignee: United States Department of the Navy
•
Filing: 1949-08-19
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Granted: 1953-08-04
•
Expires: 1969-08-19
Abstract
No abstract record available.
Inventors
- 👤 Lorus J Milne
- 👤 Arthur J Rawson
- 👤 Haldan K Hartline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:32
CPC Classifications
G; G01; G01C; G01C3/00; G01C3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB154928A
Cited
US1916678A
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US2199662A
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US2187542A
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US2492383A
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US2410725A
Cited
US2436576A
Cited
GB615699A
Cited
US2517892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |