US2860491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible air conditioning system with hot gas defrosting means
Assignee: Kramer Trenton Co
•
Filing: 1954-11-05
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Granted: 1958-11-18
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Expires: 1974-11-05
Abstract
No abstract record available.
Inventors
- 👤 Goldenberg David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:38
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022; F25B47/025; F22; F22G; F22G5/00; F22G5/16; F24; F24F; F24F3/00; F24F3/001; F25B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1935281A
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US2694904A
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US2726067A
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US2725724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |