US2422972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Winged-strap rotary compressor
Assignee: Individual
•
Filing: 1944-05-26
•
Granted: 1947-06-24
•
Expires: 1964-05-26
Abstract
No abstract record available.
Inventors
- 👤 Frank W Knowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:27
CPC Classifications
F; F04; F04B; F04B23/00; F04B23/04; F04B23/08; F04B23/10; F04C; F04C18/00; F04C18/30; F04C18/40; F04C18/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US751014A
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US845114A
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US1379248A
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US1624607A
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US1591030A
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US1616913A
Cited
US2134936A
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US1890574A
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US2094525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-23 | 1950-12-23 | 1951-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-23 | 1954-12-23 | 1955-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-23 | 1958-12-23 | 1959-06-24 | $7700.00 | Window Closed / Lapsed |