US2835656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive polymers for photography
Assignee: Eastman Kodak Co
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Filing: 1953-11-25
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Granted: 1958-05-20
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Expires: 1973-11-25
Abstract
No abstract record available.
Inventors
- 👤 Cornelius C Unruh
- 👤 Donald A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:20
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0388; C; C08; C08F; C08F8/00; C08F8/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD FOR PREPARING A LIGHT-SENSITIVE POLYMER WHICH COMPRISES HEATING A COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE WITH A MONESTER OF AN ACID OF THE CLASS CONSISTING OF CINNAMIC ACID, O-CHLORO CINNAMIC ACID AND M-NITRO CINNAMIC ACIOD AND A GLYCOL OF THE CLASS CONSISTING OF ETHYLENE GLYCOL, PROPYLENE GLYCOLS, BUTYLENE GLYCOLS, DIETHYLENE GLYCOL AND TRIETHYLENE GLYCOL, IN AN INERT ORGANIC SOLVENT UNTIL A LIGHT-SENSITIVE ORGANIC SOLVENT SOLUBLE POLYMER HAS BEEN OBTAINED, AND ISOLATING THE POLYMER FROM THE REACTION MIXTURE.
Claim 2
Independent Claim
79 words
A METHOD FOR PREPARING A LIGHT-SENSITIVE POLYMER WHICH COMPRISES HEATING A COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE WITH A MONESTER OF AN ACID OF THE CLASS CONSISTING OF CINNAMIC ACID, O-CHLORO CINNAMIC ACID AND M-NITRO CINNAMIC ACIOD AND A GLYCOL OF THE CLASS CONSISTING OF ETHYLENE GLYCOL, PROPYLENE GLYCOLS, BUTYLENE GLYCOLS, DIETHYLENE GLYCOL AND TRIETHYLENE GLYCOL, IN AN INERT ORGANIC SOLVENT UNTIL A LIGHT-SENSITIVE ORGANIC SOLVENT SOLUBLE POLYMER HAS BEEN OBTAINED, AND ISOLATING THE POLYMER FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2324739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |