US2775260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spool valves
Assignee: Commercial Shearing Inc
•
Filing: 1952-10-30
•
Granted: 1956-12-25
•
Expires: 1972-10-30
Abstract
No abstract record available.
Inventors
- 👤 John H Drennen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:09
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/06; F15B13/08; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86485; Y10T137/87169; Y10T137/87177; Y10T137/87185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US498818A
Cited
US1285769A
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GB166619A
Cited
US2401258A
Cited
US2370371A
Cited
US2503827A
Cited
US2600702A
Cited
US2605108A
Cited
US2614503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |