Patent US2290813A successfully refreshed from Google Patents.
US2290813A
Expired / Lapsed
US
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Compressor shaft seal
Assignee: Servel Inc
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Filing: 1940-06-28
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Granted: 1942-07-21
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Expires: 1960-06-28
Abstract
No abstract record available.
Inventors
- 👤 Ploeger Clyde Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:08
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/0094; F04B39/02; F04B39/0223; F04B39/023; F04B39/0238; F04B39/0246; F04B39/04; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/36; F16J15/363; Y; Y10; Y10S; Y10S277/00; Y10S277/907
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) | 1945-07-20 | 1946-01-19 | 1946-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-07-20 | 1950-01-19 | 1950-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-07-20 | 1954-01-19 | 1954-07-21 | $7700.00 | Window Closed / Lapsed |