Patent US2983480A successfully refreshed from Google Patents.
US2983480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve stem and reciprocating shaft seal
Assignee: WR Grace and Co
•
Filing: 1956-07-02
•
Granted: 1961-05-09
•
Expires: 1976-07-02
Abstract
No abstract record available.
Inventors
- 👤 David G Greenlie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:33
CPC Classifications
B; B05; B05C; B05C17/00; B05C17/005; B05C5/00; B05C5/02; B05C5/0225; F; F16; F16K; F16K41/00; F16K41/10; F16K41/12; Y; Y10; Y10S; Y10S277/00; Y10S277/91
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US351828A
Cited
US607265A
Cited
US695378A
Cited
US2444703A
Cited
US2597474A
Cited
US2699801A
Cited
US2743738A
Cited
US2742785A
Cited
US2880620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |