US3528496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plate-fin heat exchanger
Assignee: Union Carbide Corp
•
Filing: 1967-11-03
•
Granted: 1970-09-15
•
Expires: 1987-11-03
Abstract
No abstract record available.
Inventors
- 👤 Leslie C Kun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:15
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; 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)
US1899080A
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US2566310A
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US2549466A
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US2601973A
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US2663550A
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US2870998A
Cited
US3079994A
Cited
US2875986A
Cited
US2952445A
Cited
US3148442A
Cited
US3282334A
Cited
US3313343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |