Patent US4920004A successfully refreshed from Google Patents.
US4920004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gelatin-grafted polymer particles
Assignee: Eastman Kodak Co
•
Filing: 1989-02-07
•
Granted: 1990-04-24
•
Expires: 2009-02-07
Abstract
Abstract There are disclosed polymer particles that are individually covered with gelatin that is covalently bonded thereto. The particles are useful in a variety of applications, such as photographic matting agents.
Inventors
- 👤 Pranab Bagchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:54
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/95; Y; Y10; Y10S; Y10S430/00; Y10S430/151; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
38 words
A particle comprising polymer core having a mean diameter of from about 10 to 10 6 nm covered with a gelatin shell about 10 to 60 nm thick, said gelatin being covalently bonded to the said polymer core.
Claim 2
Dependent Claim
38 words
A particle comprising polymer core having a mean diameter of from about 10 to 10 6 nm covered with a gelatin shell about 10 to 60 nm thick, said gelatin being covalently bonded to the said polymer core.
Claim 3
Dependent Claim
47 words
A particle according to claim 1 wherein said polymer is derived from a monomer comprising an active halogen atom, an isocyanate group, an epoxide group, an aldehyde group, a chloroethylsulfone group, a vinyl sulfone group, an amine group, a carboxylic acid group, or an active methylene group.
Claim 4
Dependent Claim
58 words
A particle according to claim 2 wherein said polymer comprises from 0.1 to 100 mole percent of a copolymer that is derived from a monomer comprising an active halogen atom, an isocyanate group, an epoxide group, an aldehyde group, a chloroethylsulfone group, a vinyl sulfone group, an amine group, a carboxylic acid group, or an active methylene group.
Claim 5
Dependent Claim
56 words
A particle according to claim 1 wherein said polymer comprises repeating units of the formula: ##STR2## wherein A represents recurring units derived from one or more monomers that are capable of covalently bonding with gelatin, B represents recurring units derived from one or more other ethylenically unsaturated monomers, and x represents 0.1 to 100 mole percent.
Claim 6
Dependent Claim
50 words
A particle according to claim 4 wherein A represents recurring units derived from one or more monomers comprising an active halogen atom, an isocyanate group, an epoxide group, an aldehyde group, a chloroethylsulfone group, a vinyl sulfone group, an amine group, a carboxylic acid group, or an active methylene group.
References Cited (Backward Citations)
US2787545A
Cited
US3287289A
Cited
US3507661A
Cited
US3853987A
Cited
US3767448A
Cited
US4070296A
Cited
US4172731A
Cited
US4328301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |