Patent US3497936A successfully refreshed from Google Patents.
US3497936A
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US
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Method of making a heat exchanger
Assignee: LONG MANUFACTURING Ltd A CORP OF CANADA
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Filing: 1966-02-25
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Granted: 1970-03-03
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Expires: 1986-02-25
Abstract
No abstract record available.
Inventors
- 👤 Desmond M Donaldson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:00
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0234; F01; F01M; F01M5/00; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/0535; F28D1/05366; F28F1/00; F28F1/02; F28F1/025; F28F9/0219; F28F9/0221; Y; Y10; Y10S; Y10S165/00; Y10S165/916; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373; Y10T29/49389; Y10T29/51; Y10T29/5188
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1428901A
Cited
US1340774A
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US1953927A
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US1896355A
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US2222721A
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US2360123A
Cited
US3255517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |