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US3521707A
Expired / Lapsed
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Heat exchangers
Assignee: Associated Engineering Ltd
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Filing: 1968-08-26
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Granted: 1970-07-28
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Expires: 1988-08-26
Abstract
No abstract record available.
Inventors
- 👤 Dennis Cockburn Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:39
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F28F3/025; F28F3/027; F28F2275/00; F28F2275/02; F28F2275/025; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/373; Y10S165/374; Y10S165/379; Y10S165/381; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49826; Y10T29/49904
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) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |