Patent US3443634A successfully refreshed from Google Patents.
US3443634A
Expired / Lapsed
US
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Heat exchangers
Assignee: Peerless of America Inc
•
Filing: 1967-04-06
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Granted: 1969-05-13
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Expires: 1987-04-06
Abstract
No abstract record available.
Inventors
- 👤 Stephen F Pasternak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:10
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; F28F2215/00; F28F2215/12; Y; Y10; Y10S; Y10S165/00; Y10S165/51; Y10S165/518; Y10S165/522; Y10S165/523
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2899178A
Cited
US2038912A
Cited
US1960955A
Cited
US2434676A
Cited
US2427336A
Cited
US2913806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |