US3523577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange system
Assignee: Union Carbide Corp
•
Filing: 1968-04-01
•
Granted: 1970-08-11
•
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
2026-10-25 14:49
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1922254A
Cited
US1775358A
Cited
US1931268A
Cited
US2350347A
Cited
US2350348A
Cited
US2448315A
Cited
US2565221A
Cited
US2675333A
Cited
US2700624A
Cited
US2826309A
Cited
US3045138A
Cited
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 |