US3409075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrix heat exchange cores
Assignee: Union Carbide Corp
•
Filing: 1965-08-20
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Granted: 1968-11-05
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Expires: 1985-08-20
Abstract
No abstract record available.
Inventors
- 👤 Hugh M Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:49
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/003; F28F3/00; F28F3/08; F28F3/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA687662A
Cited
US2240537A
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US2423869A
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US2451629A
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US2616668A
Cited
US3183967A
Cited
US3222234A
Cited
US3228460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |