Patent US2772900A successfully refreshed from Google Patents.
US2772900A
Expired / Lapsed
US
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Sealing device
Assignee: WM R WHITTAKER CO Ltd
•
Filing: 1953-01-02
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Granted: 1956-12-04
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Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Rodney B Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:09
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3208; F16J15/56; Y; Y10; Y10S; Y10S277/00; Y10S277/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US613041A
Cited
CA477462A
Cited
US1205887A
Cited
US1347351A
Cited
US1438527A
Cited
GB224101A
Cited
US2402114A
Cited
GB567346A
Cited
US2427787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |