Patent US2939628A successfully refreshed from Google Patents.
US2939628A
Expired / Lapsed
US
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Compressor having sinusoidal impellers
Assignee: Individual
•
Filing: 1957-05-14
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Granted: 1960-06-07
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Expires: 1977-05-14
Abstract
No abstract record available.
Inventors
- 👤 Schueller Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:52
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/12; F04C18/14; F04C18/20; F04C18/126; F04C29/00; F04C29/0042; F04C29/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL36923C
Cited
US710756A
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FR427472A
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FR446287A
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US1771863A
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DE518994C
Cited
US1837714A
Cited
US1846692A
Cited
US2013397A
Cited
US2115325A
Cited
US2225908A
Cited
GB502079A
Cited
US2845872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |