US2956787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat interchanger
Assignee: Union Carbide Corp
•
Filing: 1957-05-28
•
Granted: 1960-10-18
•
Expires: 1977-05-28
Abstract
No abstract record available.
Inventors
- 👤 Samuel H S Raub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:08
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/02; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/053; Y10S165/054; Y10S165/055; Y10S165/056
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US596874A
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US827479A
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US1159775A
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US2181486A
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GB514948A
Cited
US2461636A
Cited
US2447259A
Cited
US2460660A
Cited
US2581121A
Cited
US2498145A
Cited
US2715516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |