Patent US2757628A successfully refreshed from Google Patents.
US2757628A
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Method of making a multiple passage heat exchanger tube
Assignee: Motors Liquidation Co
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Filing: 1952-09-17
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Granted: 1956-08-07
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Expires: 1972-09-17
Abstract
No abstract record available.
Inventors
- 👤 Hal C Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:58
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/151; B21C37/156; B21C37/157; B21C37/22; B21C37/225; B21D53/08; B21D53/085; F; F28; F28D; F28D1/00; F28D1/02; F28D1/03; F28D1/0391; F28D9/00; F28D9/0025; F28F; F28F3/00; F28F3/02; F28F3/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/4938
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) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |