US3507764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining glyoxal
Assignee: Daicel Corp
•
Filing: 1967-04-10
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Granted: 1970-04-21
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Expires: 1987-04-10
Abstract
No abstract record available.
Inventors
- 👤 Akira Asahi
- 👤 Masayuki Maehara
- 👤 Masami Sakow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:47
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/52; C; C07; C07C; C07C45/00; C07C45/27; C07C45/28; C07C45/78; C07C45/786; C07C45/81; C07C45/82; C07C45/85; B01D2317/00; B01D2317/02; B01D2317/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124522A
Cited
US2860091A
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US3239442A
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US3063924A
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US3330749A
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US3290173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |