US2933904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system
Assignee: Carrier Corp
•
Filing: 1957-03-15
•
Granted: 1960-04-26
•
Expires: 1977-03-15
Abstract
No abstract record available.
Inventors
- 👤 Donald C Wellman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:50
CPC Classifications
F; F25; F25B; F25B1/00; F25B2339/00; F25B2339/04; F25B2339/041; F25B2400/00; F25B2400/16; Y; Y10; Y10S; Y10S62/00; Y10S62/17
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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |