US2989966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft seal
Assignee: United States Steel Corp
•
Filing: 1957-02-21
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Granted: 1961-06-27
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Expires: 1977-02-21
Abstract
No abstract record available.
Inventors
- 👤 William A Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:01
CPC Classifications
B; B65; B65G; B65G49/00; B65G49/02; B65G49/04; B65G49/0404; B65G39/00; B65G39/02; B65G39/09; F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/38; B65G2201/00; B65G2201/02; B65G2201/0214; B65G2201/0217; B65G2201/04; Y; Y10; Y10S; Y10S277/00; Y10S277/921
Claims Analysis
Total Claims: 0
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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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |