Patent US2921445A successfully refreshed from Google Patents.
US2921445A
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US
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Centrifugal refrigeration machines
Assignee: Carrier Corp
•
Filing: 1956-02-17
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Granted: 1960-01-19
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Expires: 1976-02-17
Abstract
No abstract record available.
Inventors
- 👤 Carlyle M Ashley
- 👤 Zulinke Adolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:31
CPC Classifications
F; F25; F25B; F25B1/00; F25B1/04; F25B1/053; F25B2400/00; F25B2400/13; F25B2400/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2249882A
Cited
US2277647A
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US2770106A
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US2746269A
Cited
US2768511A
Cited
US2776542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |