Patent US2181978A successfully refreshed from Google Patents.
US2181978A
Expired / Lapsed
US
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Variable capacity compressor
Assignee: Worthington Pump and Machinery Corp
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Filing: 1938-03-11
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Granted: 1939-12-05
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Expires: 1958-03-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward M Paullin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:31
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/02; F04B49/022; F04B49/06
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) | 1942-12-04 | 1943-06-05 | 1943-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-12-04 | 1947-06-05 | 1947-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-12-04 | 1951-06-05 | 1951-12-05 | $7700.00 | Window Closed / Lapsed |