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Patent US2621487A successfully refreshed from Google Patents.
US2621487A
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Safety control means for refrigerating systems
Assignee: Individual
•
Filing: 1951-12-12
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Granted: 1952-12-16
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Expires: 1971-12-12
Abstract
No abstract record available.
Inventors
- 👤 George H Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:16
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19700E
Cited
US2327544A
Cited
US2269864A
Cited
US2355894A
Cited
US2389073A
Cited
US2439331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |