Patent US2975959A successfully refreshed from Google Patents.
US2975959A
Expired / Lapsed
US
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Back-to-back centrifugal compressor and centripetal turbine having an integral rotordisc
Assignee: Individual
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Filing: 1958-09-30
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Granted: 1961-03-21
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Expires: 1978-09-30
Abstract
No abstract record available.
Inventors
- 👤 Berry W Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:05
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; F01D5/04; F01D5/043; F01D5/046; F01D5/12; F01D5/28; F02; F02C; F02C3/00; F02C3/04; F02C3/045; F02C3/05
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) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |