Patent US2228194A successfully refreshed from Google Patents.
US2228194A
Expired / Lapsed
US
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Centrifugal compressor
Assignee: Individual
•
Filing: 1939-08-16
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Granted: 1941-01-07
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Expires: 1959-08-16
Abstract
No abstract record available.
Inventors
- 👤 Birkigt Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:01
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/284; F04D29/40; F04D29/42; F04D29/44; F04D29/441; F04D29/444; F05; F05D; F05D2250/00; F05D2250/50; F05D2250/52
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) | 1944-01-07 | 1944-07-08 | 1945-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-01-07 | 1948-07-08 | 1949-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-01-07 | 1952-07-08 | 1953-01-07 | $7700.00 | Window Closed / Lapsed |