Patent US3586709A successfully refreshed from Google Patents.
Patent US3153446A successfully refreshed from Google Patents.
US3153446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: RTX Corp
•
Filing: 1960-08-12
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Granted: 1964-10-20
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Expires: 1980-08-12
Abstract
No abstract record available.
Inventors
- 👤 Robert H Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:37
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/0058; F28D7/0008; F28D7/0025; F28D7/0066; F28D7/0075; F28F; F28F1/00; F28F1/02; F28F1/04; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/442; Y10S165/449
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A HEAT EXCHANGER CELL COMPRISING A LONGITUDINAL DUCT OF SUBSTANTIAL SIZE AND RECTANGULAR IN CROSS SECTION HAVING FOUR PLANAR SIDES AND THROUGH WHICH AIR IS ADAPTED TO BE PASSED, AND A PLURALITY OF CROSSFLOW PIPES TO EACH OF WHICH A SECOND FLUID IS SEPARATELY SUPPLIED EXTENDING TRANSVERSELY OF THE AXIS OF SAID DUCT EXTERNAL OF SAID DUCT ALONG AND PAST EACH OF ITS SIDES, EACH OF SAID PIPES EXTENDING ACROSS ONE SIDE ONLY OF SAID DUCT, SAID PIPES BEING
Claim 2
Dependent Claim
79 words
A HEAT EXCHANGER CELL COMPRISING A LONGITUDINAL DUCT OF SUBSTANTIAL SIZE AND RECTANGULAR IN CROSS SECTION HAVING FOUR PLANAR SIDES AND THROUGH WHICH AIR IS ADAPTED TO BE PASSED, AND A PLURALITY OF CROSSFLOW PIPES TO EACH OF WHICH A SECOND FLUID IS SEPARATELY SUPPLIED EXTENDING TRANSVERSELY OF THE AXIS OF SAID DUCT EXTERNAL OF SAID DUCT ALONG AND PAST EACH OF ITS SIDES, EACH OF SAID PIPES EXTENDING ACROSS ONE SIDE ONLY OF SAID DUCT, SAID PIPES BEING
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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) | 1967-10-20 | 1968-04-20 | 1968-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-20 | 1972-04-20 | 1972-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-20 | 1976-04-20 | 1976-10-20 | $7700.00 | Window Closed / Lapsed |