Patent US3472316A successfully refreshed from Google Patents.
US3472316A
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Layered heat exchanger with interlocking header plates
Assignee: COUCH IND Inc
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Filing: 1967-12-07
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Granted: 1969-10-14
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Expires: 1987-12-07
Abstract
No abstract record available.
Inventors
- 👤 Virgil R Couch Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:35
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/18; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/05316; F28D1/05333; F28F9/0219; F28F9/0224; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/471; Y10S165/489; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |