Patent US3028140A successfully refreshed from Google Patents.
US3028140A
Expired / Lapsed
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Rotary fluid flow machine having rotor vanes constructed according to three dimensional calculations
Assignee: Individual
•
Filing: 1957-06-17
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Granted: 1962-04-03
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Expires: 1977-06-17
Abstract
No abstract record available.
Inventors
- 👤 James R Lage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:02
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; F01D5/04; F01D5/043; F01D5/048; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/284; F04D29/30; F05; F05D; F05D2250/00; F05D2250/20
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |