US1781073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary compressor
Assignee: KEYSTONE REFRIGERATING Corp
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Filing: 1928-06-16
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Granted: 1930-11-11
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Expires: 1948-06-16
Abstract
No abstract record available.
Inventors
- 👤 Nielsen Holger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:07
CPC Classifications
F; F04; F04C; F04C28/00; F04C28/28; F04C18/00; F04C18/30; F04C18/34; F04C18/344; F04C18/3441
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) | 1933-11-10 | 1934-05-12 | 1934-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-11-10 | 1938-05-12 | 1938-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-11-10 | 1942-05-12 | 1942-11-11 | $7700.00 | Window Closed / Lapsed |