US2497874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical time delay mechanism
Assignee: Plywood Res Foundation
•
Filing: 1947-08-25
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Granted: 1950-02-21
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Expires: 1967-08-25
Abstract
No abstract record available.
Inventors
- 👤 Harold R Evans
- 👤 Dale L Schubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:41
CPC Classifications
B; B65; B65G; B65G47/00; B65G47/52; B65G47/53; B07; B07C; B07C5/00; B07C5/36; B07C5/361; B65G47/68; B65G47/71
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |