US2479821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for refrigeration
Assignee: Shell Development Co
•
Filing: 1946-03-30
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Granted: 1949-08-23
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Expires: 1966-03-30
Abstract
No abstract record available.
Inventors
- 👤 Robert K Deutsch
- 👤 Frithjof A Larson
- 👤 Vernon E Middlebrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:08
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F25D3/105; F25D29/00; F25D29/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |