US3452552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of absorption refrigeration systems
Assignee: Carrier Corp
•
Filing: 1967-11-20
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Granted: 1969-07-01
•
Expires: 1987-11-20
Abstract
No abstract record available.
Inventors
- 👤 Stuart E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:47
CPC Classifications
F; F25; F25B; F25B15/00; F25B15/02; F25B15/06; F25B49/00; F25B49/04; F25B49/043; F25B2315/00; F25B2315/001; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2855765A
Cited
US3314246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |