US2791891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration heat exchange circuit
Assignee: Individual
•
Filing: 1955-06-22
•
Granted: 1957-05-14
•
Expires: 1975-06-22
Abstract
No abstract record available.
Inventors
- 👤 Lance General W Ace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:00
CPC Classifications
F; F25; F25B; F25B39/00; F25B39/04; F25B40/00; F25B40/02; F25B2339/00; F25B2339/04; F25B2339/047
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) | 1960-05-13 | 1960-11-12 | 1961-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-13 | 1964-11-12 | 1965-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-13 | 1968-11-12 | 1969-05-14 | $7700.00 | Window Closed / Lapsed |