US2647452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air blending temperature control for heating and cooling systems
Assignee: Vapor Heating Corp
•
Filing: 1948-01-30
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Granted: 1953-08-04
•
Expires: 1968-01-30
Abstract
No abstract record available.
Inventors
- 👤 Laurance H Gillick
- 👤 Edward A Russell
- 👤 Norman O Kirkby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:01
CPC Classifications
B; B61; B61D; B61D27/00; B61D27/0018
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US67894A
Cited
US2204114A
Cited
US986731A
Cited
US1853459A
Cited
US2199341A
Cited
US2154801A
Cited
US2351772A
Cited
US2424828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |