US3181602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers
Assignee: Davidson and Co Ltd
•
Filing: 1961-06-05
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Granted: 1965-05-04
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Expires: 1981-06-05
Abstract
No abstract record available.
Inventors
- 👤 Johnstone Archibald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:19
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/041; F28D19/042; F28D19/044; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/037; Y10S165/038; Y10S165/039
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A REGENERATIVE HEAT EXCHANGER COMPRISING A STATIONARY CYLINDRICAL CASING DIVIDED INTO SEGMENTS, REGENERATIVE MATERIAL IN THE SAID SEGMENTS, A PLURALITY OF DUCTS AT EACH END OF THE CASING AND ROTATABLE WITH RESPECT TO THE SEGMENTS, AN ACCESS OPENING TO EACH SEGMENT IN THE PERIPHERY OF THE CASING, A DOOR TO EACH SAID OPENING, AND MOVABLE BLANKING-OFF PLATES FOR CLOSING THE ENDS OF A SELECTED SEGMENT, EACH SAID PLATE INCLUDING MEANS EXTENDING TO AND OPERABLE FROM THE EXTERIOF OF SAID CASING FOR SHIFTING ITS POSITION TO ISOLATE THAT SEGMENT FROM THE ROTATABLE DUCTS DEFORE THE DOOR TO THAT SEGMENT IS MOVED TO PROVIDE ACCESS TO THE SEGMENT.
Claim 2
Dependent Claim
106 words
A REGENERATIVE HEAT EXCHANGER COMPRISING A STATIONARY CYLINDRICAL CASING DIVIDED INTO SEGMENTS, REGENERATIVE MATERIAL IN THE SAID SEGMENTS, A PLURALITY OF DUCTS AT EACH END OF THE CASING AND ROTATABLE WITH RESPECT TO THE SEGMENTS, AN ACCESS OPENING TO EACH SEGMENT IN THE PERIPHERY OF THE CASING, A DOOR TO EACH SAID OPENING, AND MOVABLE BLANKING-OFF PLATES FOR CLOSING THE ENDS OF A SELECTED SEGMENT, EACH SAID PLATE INCLUDING MEANS EXTENDING TO AND OPERABLE FROM THE EXTERIOF OF SAID CASING FOR SHIFTING ITS POSITION TO ISOLATE THAT SEGMENT FROM THE ROTATABLE DUCTS DEFORE THE DOOR TO THAT SEGMENT IS MOVED TO PROVIDE ACCESS TO THE SEGMENT.
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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) | 1968-05-03 | 1968-11-02 | 1969-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-03 | 1972-11-02 | 1973-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-03 | 1976-11-02 | 1977-05-04 | $7700.00 | Window Closed / Lapsed |