US2920380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making plate-type heat exchanger
Assignee: Olin Corp
•
Filing: 1957-08-29
•
Granted: 1960-01-12
•
Expires: 1977-08-29
Abstract
No abstract record available.
Inventors
- 👤 Henry M Williams
- 👤 Huntly M Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:21
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21D53/045; F; F28; F28F; F28F3/00; F28F3/02; F28F3/025; F28F3/027; F25; F25B; F25B2339/00; F25B2339/04; F25B2339/043; F28F2255/00; F28F2255/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49369; Y10T29/49371
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2471960A
Cited
US2585736A
Cited
US2690002A
Cited
US2759247A
Cited
US2676001A
Cited
US2703702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |