US3159378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing construction for piston valve
Assignee: Shafer Valve Co
•
Filing: 1961-08-31
•
Granted: 1964-12-01
•
Expires: 1981-08-31
Abstract
No abstract record available.
Inventors
- 👤 Robert T Haag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:46
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/22; F16K3/24; F16K3/26; Y; Y10; Y10S; Y10S251/00; Y10S251/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2704650A
Cited
US1153973A
Cited
DE409308C
Cited
US2631002A
Cited
US2923310A
Cited
GB879570A
Cited
US3048191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |