US3453838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system
Assignee: Dunham Bush Inc
•
Filing: 1967-03-10
•
Granted: 1969-07-08
•
Expires: 1987-03-10
Abstract
No abstract record available.
Inventors
- 👤 Alan S Decker
- 👤 Hans P Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:48
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2281770A
Cited
US2688850A
Cited
US2713249A
Cited
US2892318A
Cited
US2978877A
Cited
US3071935A
Cited
US3213637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |