Patent US271941A successfully refreshed from Google Patents.
Patent US2959937A successfully refreshed from Google Patents.
US2959937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system for air conditioning units
Assignee: —
•
Filing: —
•
Granted: 1960-11-15
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Expires: 1977-11-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:58
CPC Classifications
F; F25; F25B; F25B1/00; F25B1/04; F25B13/00; F25B41/00; F25B41/30; F25B41/37; F25B2400/00; F25B2400/13; F25B2600/00; F25B2600/21
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-15 | 1964-05-16 | 1964-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-15 | 1968-05-16 | 1968-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-15 | 1972-05-16 | 1972-11-15 | $7700.00 | Window Closed / Lapsed |