US2957679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Olin Corp
•
Filing: 1955-06-02
•
Granted: 1960-10-25
•
Expires: 1975-06-02
Abstract
No abstract record available.
Inventors
- 👤 Huntly M Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:28
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; F; F28; F28D; F28D1/00; F28D1/02; F28D1/03; F28D1/0358; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/471; Y10S165/485; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |