Patent US3517733A successfully refreshed from Google Patents.
US3517733A
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US
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Heat exchangers
Assignee: Clarke Chapman Group Ltd
•
Filing: 1969-08-20
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Granted: 1970-06-30
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Expires: 1989-08-20
Abstract
No abstract record available.
Inventors
- 👤 Ronald Vivian Tasker
- 👤 Raymond Leslie Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:21
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F28F3/025; F28D; F28D9/00; F28D9/0062; F28D9/0068; F28F2250/00; F28F2250/10; F28F2250/108; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/387; Y10S165/391
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) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |