Patent US3056576A successfully refreshed from Google Patents.
US3056576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Replaceable seat washer in spherical plug valve
Assignee: Homestead Valve Manufacturing Co
•
Filing: 1959-12-10
•
Granted: 1962-10-02
•
Expires: 1979-12-10
Abstract
No abstract record available.
Inventors
- 👤 Robert P Kulisek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:19
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/08; F16K5/14; F16K5/20; F16K5/205; F16K5/208; F16K5/06; F16K5/0626; F16K5/0631
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |