US2389175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making heat exchange apparatus
Assignee: CLIFFORD MANUFACTURING Co
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Filing: 1942-10-07
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Granted: 1945-11-20
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Expires: 1962-10-07
Abstract
No abstract record available.
Inventors
- 👤 John E Woods
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:59
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0244; B23K1/00; B23K1/0008; B23K1/0012; F; F28; F28F; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-11-19 | 1949-05-21 | 1949-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-11-19 | 1953-05-21 | 1953-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-11-19 | 1957-05-21 | 1957-11-20 | $7700.00 | Window Closed / Lapsed |