Patent US2300385A successfully refreshed from Google Patents.
US2300385A
Expired / Lapsed
US
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Rotary shaft seal
Assignee: Allis Chalmers Corp
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Filing: 1940-07-17
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Granted: 1942-10-27
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Expires: 1960-07-17
Abstract
No abstract record available.
Inventors
- 👤 Gustaf L Kollberg
- 👤 Melvin C Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:57
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3404; F16J15/3408; F16J15/3412; F16J15/342; Y; Y10; Y10S; Y10S277/00; Y10S277/914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-10-26 | 1946-04-27 | 1946-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-10-26 | 1950-04-27 | 1950-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-10-26 | 1954-04-27 | 1954-10-27 | $7700.00 | Window Closed / Lapsed |