Patent US3451474A successfully refreshed from Google Patents.
US3451474A
Expired / Lapsed
US
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Corrugated plate type heat exchanger
Assignee: Motors Liquidation Co
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Filing: 1967-07-19
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Granted: 1969-06-24
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Expires: 1987-07-19
Abstract
No abstract record available.
Inventors
- 👤 Dean M Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:08
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/08; F28; F28D; F28D9/00; F28D9/0081; F28F; F28F3/00; F28F3/02; F28F3/04; F05; F05D; F05D2250/00; F05D2250/60; F05D2250/61; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/373
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) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |