Patent US3522304A successfully refreshed from Google Patents.
US3522304A
Expired / Lapsed
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Preparation of polyhydroxy diureas
Assignee: Wyandotte Chemicals Corp
•
Filing: 1967-07-03
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Granted: 1970-07-28
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Expires: 1987-07-03
Abstract
No abstract record available.
Inventors
- 👤 Herwart C Vogt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:50
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/20; C07D295/215; C07C; C07C273/00; C07C273/18; C07C273/1854; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |