US3535342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making alkylene carbonates
Assignee: Dow Chemical Co
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Filing: 1968-02-07
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Granted: 1970-10-20
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Expires: 1988-02-07
Abstract
No abstract record available.
Inventors
- 👤 Albert H Emmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:30
CPC Classifications
C; C07; C07D; C07D317/00; C07D317/08; C07D317/10; C07D317/32; C07D317/34; C07D317/36; B; B01; B01J; B01J31/00; B01J31/02; B01J31/0234; B01J31/0235; B01J31/0245; B01J31/0251; B01J2231/00; B01J2231/30; B01J2231/32; B01J2231/324; B01J2231/327
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2873282A
Cited
US2766258A
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US2773070A
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US2773881A
Cited
GB760966A
Cited
US2993908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |