US2555679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid displacement rotary machine
Assignee: Individual
•
Filing: 1949-06-09
•
Granted: 1951-06-05
•
Expires: 1969-06-09
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Cornwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/40; F04C2/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US380489A
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US392356A
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US471279A
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US1320892A
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US1831243A
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GB381371A
Cited
US2178405A
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US2260809A
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US2281157A
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US2421013A
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US2460251A
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US2477371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |