US2268386A
Expired / Lapsed
US
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Heat exchanger apparatus
Assignee: Standard Oil Development Co
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Filing: 1939-12-29
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Granted: 1941-12-30
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Expires: 1959-12-29
Abstract
No abstract record available.
Inventors
- 👤 Harold W Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:43
CPC Classifications
F; F01; F01N; F01N5/00; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D7/00; F28D7/02; F28D7/024; F28F; F28F9/00; F28F9/24; F28D2021/0019; F28D2021/008; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/416; Y10S165/417
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) | 1944-12-29 | 1945-06-30 | 1945-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-12-29 | 1949-06-30 | 1949-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-12-29 | 1953-06-30 | 1953-12-30 | $7700.00 | Window Closed / Lapsed |