US2551666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous removal of impurities from refrigerant during a refrigeration process
Assignee: Phillips Petroleum Co
•
Filing: 1948-05-24
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Granted: 1951-05-08
•
Expires: 1968-05-24
Abstract
No abstract record available.
Inventors
- 👤 Forrest E Gilmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:31
CPC Classifications
F; F25; F25B; F25B43/00; F25B41/00; F25B41/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US320307A
Cited
GB336337A
Cited
US2271542A
Cited
US2155051A
Cited
US2149358A
Cited
US2287441A
Cited
US2292259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |