US3448770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot air transfer valve with constant flow area for all valve positions
Assignee: CONSECO Inc
•
Filing: 1966-04-22
•
Granted: 1969-06-10
•
Expires: 1986-04-22
Abstract
No abstract record available.
Inventors
- 👤 John W Edgemond Jr
- 👤 John L Boyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:23
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/04; F16K3/06; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/877; Y10T137/87788; Y10T137/87812
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA534453A
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US858100A
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US2273720A
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US2696220A
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US2772695A
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US2809584A
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US3151894A
Cited
US3174709A
Cited
US3246917A
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US3140741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |