US2931173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound rotary compressor
Assignee: Individual
•
Filing: 1954-08-24
•
Granted: 1960-04-05
•
Expires: 1974-08-24
Abstract
No abstract record available.
Inventors
- 👤 Richard L Schapker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:28
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/16; F02C9/18; F02C3/00; F02C3/04; F02C3/06; F02C3/067; F04; F04D; F04D19/00; F04D19/02; F04D19/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2575682A
Cited
US2651492A
Cited
US2587649A
Cited
US2659528A
Cited
GB687365A
Cited
US2689681A
Cited
US2645412A
Cited
US2759327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |