US2940735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Alcoa Corp
•
Filing: 1957-10-28
•
Granted: 1960-06-14
•
Expires: 1977-10-28
Abstract
No abstract record available.
Inventors
- 👤 Marsh Kirtland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:56
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/005; F28D13/00; F28F; F28F9/00; F28F9/007; F28F9/013; F28D21/00; F28D2021/0019; F28D2021/0045; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/069
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1829236A
Cited
US1781107A
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US1788386A
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US1809915A
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US2032413A
Cited
US2232936A
Cited
US2357901A
Cited
US2336879A
Cited
US2501487A
Cited
US2523484A
Cited
US2797908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |