US2686957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing heat exchanger sections
Assignee: AO Smith Corp
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Filing: 1951-08-17
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Granted: 1954-08-24
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Expires: 1971-08-17
Abstract
No abstract record available.
Inventors
- 👤 Erhardt C Koerper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:34
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/0535; F28D1/05366; F28D1/05383; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/126; F28F9/00; F28F9/02; F28F9/04; F28F9/16; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373; Y10T29/49375; 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) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |