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Patent US2553623A successfully refreshed from Google Patents.
US2553623A
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US
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Multistage refrigeration system
Assignee: Frick Co Inc
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Filing: 1944-05-05
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Granted: 1951-05-22
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Expires: 1964-05-05
Abstract
No abstract record available.
Inventors
- 👤 Frank R Zumbro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:45
CPC Classifications
F; F25; F25B; F25B1/00; F25B1/10; F25B2400/00; F25B2400/13; F25B2400/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US634335A
Cited
FR322773A
Cited
FR656641A
Cited
US1911012A
Cited
US2024323A
Cited
US2247950A
Cited
US2300005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |