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Patent US3732185A successfully refreshed from Google Patents.
US3732185A
Expired / Lapsed
US
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Polyparabanic acid derivatives
Assignee: Bayer AG
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Filing: 1971-06-28
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Granted: 1973-05-08
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Expires: 1991-06-28
Abstract
Abstract POLYPARABANIC ACID DERIVATIVES WHICH CONTAIN THE STRUCTURAL UNIT: -(2,4-DI(Z=),5-X,5-Y-IMIDAZOLIDIN-1,3-YLENE)- REPREATEDLY IN ONE MOLECULE, IN THIS STRUCTURAL UNIT Z=O OR S, X AND Y, WHICH MAY BE THE SAME OR DIFFERENT, REPRESENT RADICAL OF THE FORMULA -NR1R2, -OR1 OR -SR1, WHERE R1 REPRESENTS AN OPTIONALLY SUBSTITUTED AKYL, OPTIONALLY SUBSTITUTED ALKYL, OPTIONALLY SUBSTITUTED CYCLOALKYL OR OPTIONALLY SUBSTITUTED ARYL RADICAL, AND R2 REPRESENTS HALOGEN OR HAS THE SAME MEANING AS R1, OR R1 AND R2 TOGETHER CAN ALSO REPRESENT AN ALYLENE OR ARYLENE RADICAL WHICH JOINS X AND Y TOGETHER TO FORM A RING, AND PROCESS FOR THEIR PRODUCTION.
Inventors
- 👤 J Hocker
- 👤 R Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:14
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/04; C08G18/06; C08G18/28; C08G18/30; C08G73/00; C08G73/06; C08G73/0605; C08G73/0616
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |