US3426841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers having plastic components
Assignee: Individual
•
Filing: 1966-05-18
•
Granted: 1969-02-11
•
Expires: 1986-05-18
Abstract
No abstract record available.
Inventors
- 👤 Herbert G Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:54
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28D7/1607; F28D7/06; F28F; F28F21/00; F28F21/06; F28F21/062; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/18; F28F9/187; F28F9/22; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; F28F2275/00; F28F2275/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2240537A
Cited
US2816739A
Cited
US2807445A
Cited
US2806718A
Cited
US3001766A
Cited
US3237297A
Cited
US3053726A
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) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |