US3477504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous metal and plastic heat exchanger
Assignee: General Electric Co
•
Filing: 1967-05-29
•
Granted: 1969-11-11
•
Expires: 1987-05-29
Abstract
No abstract record available.
Inventors
- 👤 Duard B Colyer
- 👤 Robert B Fleming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:44
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/003; F28F3/00; F28F3/08; F28F3/086; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1734274A
Cited
US1863586A
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US2958935A
Cited
US3151673A
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US3216484A
Cited
US3228460A
Cited
US3308879A
Cited
US3302704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |