US2871672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration systems
Assignee: Rotol Ltd
•
Filing: 1957-01-24
•
Granted: 1959-02-03
•
Expires: 1977-01-24
Abstract
No abstract record available.
Inventors
- 👤 Boydell Kenneth Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:58
CPC Classifications
F; F25; F25B; F25B11/00; B; B64; B64D; B64D13/00; B64D13/06; F25B9/00; F25B9/002; F25B9/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2371889A
Cited
US2585570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |