Patent US3523577A successfully refreshed from Google Patents.
US3523577A
Expired / Lapsed
US
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Heat exchange system
Assignee: Union Carbide Corp
•
Filing: 1968-04-01
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Granted: 1970-08-11
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Expires: 1988-04-01
Abstract
No abstract record available.
Inventors
- 👤 Robert M Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:39
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187; F25; F25J; F25J5/00; F25J5/002; F25J5/005; F28D; F28D9/00; F28D9/0062; F28F1/00; F28F1/10; F28F1/12; F28F3/00; F28F3/02; F28F3/025; F25J2250/00; F25J2250/02; F25J2290/00; F25J2290/42; F25J2290/44; F28D21/00; F28D2021/0019; F28D2021/0033; F28F2255/00; F28F2255/18; Y; Y10; Y10S; Y10S165/00; Y10S165/183
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2448315A
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US2565221A
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US2675333A
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US2826309A
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US3045138A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |