US3527061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorption refrigeration system with refrigerant concentration control
Assignee: Whirlpool Corp
•
Filing: 1968-08-26
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Granted: 1970-09-08
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Expires: 1988-08-26
Abstract
No abstract record available.
Inventors
- 👤 Roy W Kruggel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:06
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/04; F25B49/043; F25B15/00; F25B15/02; F25B15/04; 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)
US2178561A
Cited
US3005318A
Cited
US3122002A
Cited
US3141307A
Cited
US3138938A
Cited
US3369373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-07 | 1974-03-09 | 1974-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-07 | 1978-03-09 | 1978-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-07 | 1982-03-09 | 1982-09-08 | $7700.00 | Window Closed / Lapsed |