US3478646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relief valve for hydraulic circuits
Assignee: TRACTOR CO
•
Filing: 1967-12-20
•
Granted: 1969-11-18
•
Expires: 1987-12-20
Abstract
No abstract record available.
Inventors
- 👤 John R Cryder
- 👤 Neil W Kroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:12
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/20; F15B20/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2797551A
Cited
US3181430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |