US3489209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger having plastic and metal components
Assignee: Individual
•
Filing: 1968-12-23
•
Granted: 1970-01-13
•
Expires: 1988-12-23
Abstract
No abstract record available.
Inventors
- 👤 Herbert G Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:14
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/0535; F28D1/05366; F28D1/047; F28D1/0475; F28D7/00; F28D7/06; F28D7/16; F28D7/163; F28D7/1653; F28D7/1684; F28F; F28F19/00; F28F19/02; F28F19/06; F28F21/00; F28F21/06; F28F21/062; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F2225/00; F28F2225/04; Y; Y10; Y10S; Y10S159/00; Y10S159/15; Y10S159/21; Y10S165/00; Y10S165/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3001766A
Cited
US3170227A
Cited
US3231012A
Cited
US3332479A
Cited
US3308879A
Cited
US3315740A
Cited
US3228456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |