Patent US3447602A successfully refreshed from Google Patents.
US3447602A
Expired / Lapsed
US
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Heat exchanger especially adapted for indirect heat transfer by convection
Assignee: Individual
•
Filing: 1967-06-22
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Granted: 1969-06-03
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Expires: 1987-06-22
Abstract
No abstract record available.
Inventors
- 👤 David Dalin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:46
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/26; F22; F22B; F22B21/00; F24; F24H; F24H1/00; F24H1/22; F24H1/40; F24H1/406; F28D; F28D7/00; F28D7/06; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/427; Y10S165/436; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US662255A
Cited
US2222496A
Cited
US2938712A
Cited
US2964033A
Cited
US3022982A
Cited
US3305008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |