Patent US2759708A successfully refreshed from Google Patents.
US2759708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air to air heat pump apparatus
Assignee: Drying Systems Inc
•
Filing: 1953-11-02
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Granted: 1956-08-21
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Expires: 1973-11-02
Abstract
No abstract record available.
Inventors
- 👤 Russell H Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:02
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2049625A
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US2168157A
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US2318318A
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US2496143A
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US2401560A
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US2451682A
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US2638123A
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US2530681A
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US2672734A
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US2677243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |