Patent US6518722B1 successfully refreshed from Google Patents.
US2680667A
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US
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Access door for evaporative condensers
Assignee: REFRIGERATION ENGINEERING Inc
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Filing: 1949-10-03
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Granted: 1954-06-08
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Expires: 1969-10-03
Abstract
No abstract record available.
Inventors
- 👤 Daniel D Wile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:31
CPC Classifications
F; F25; F25D; F25D7/00; F25B; F25B2339/00; F25B2339/04; F25B2339/041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2201507A
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US2223762A
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US2321749A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |