US3928299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers which contain urethane groups and which are cross-linkable by vinyl polymerisation
Assignee: Bayer AG
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Filing: 1973-09-13
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Granted: 1975-12-23
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Expires: 1993-09-13
Abstract
Abstract Polymers which contain urethane groups and cross-linkable vinyl or vinylidene groups are suitable as photocrosslinking layers and molded products which are free from tackiness and do not show any friability in the presence of atmospheric oxygen.
Inventors
- 👤 Hans Jurgen Rosenkranz
- 👤 Hans Rudolph
- 👤 Erich Wolff
- 👤 Rintelen Harald Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:53
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0388; C; C08; C08F; C08F299/00; C08F299/02; C08F299/06; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/70; C08G18/81; C08G18/8108; C08G18/8116
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
AN ORGANIC HOMOPOLYMER OR RANDOM COPOLYMER HAVING A NUMBER AVERAGE MOLECULAR WEIGHT, DETERMINED BY THE OSMOMETRIC METHOD OF GREATER THAN 1,000 WHICH CONTAINS PER MOLECULE Y RECURRING UNITS OF THE FORMULA
Claim 2
Dependent Claim
31 words
AN ORGANIC HOMOPOLYMER OR RANDOM COPOLYMER HAVING A NUMBER AVERAGE MOLECULAR WEIGHT, DETERMINED BY THE OSMOMETRIC METHOD OF GREATER THAN 1,000 WHICH CONTAINS PER MOLECULE Y RECURRING UNITS OF THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |