US2731282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft seal
Assignee: Walworth Co
•
Filing: 1953-02-04
•
Granted: 1956-01-17
•
Expires: 1973-02-04
Abstract
No abstract record available.
Inventors
- 👤 Cecilia D Mcmanus
- 👤 Oliver E Duemler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:04
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/46; Y; Y10; Y10S; Y10S417/00; Y10S417/01
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US574353A
Cited
US246185A
Cited
US1800085A
Cited
US2122560A
Cited
US2164380A
Cited
US2273129A
Cited
US2322269A
Cited
US2313308A
Cited
US2307346A
Cited
US2465848A
Cited
US2504936A
Cited
US2430918A
Cited
US2567527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |