US4439496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-proof photographic support
Assignee: Fujifilm Holdings Corp
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Filing: 1982-04-28
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Granted: 1984-03-27
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Expires: 2002-04-28
Abstract
Abstract A water-proof photographic support comprising a paper sheet coated with a polyolefin on both surfaces thereof, in which the paper sheet contains an alkylketene dimer, a cationic polyacrylamide and an anionic polyacrylamide.
Inventors
- 👤 Shigehisa Tamagawa
- 👤 Tetsuro Fuchizawa
- 👤 Minoru Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:16
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/79; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/31935
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A water-proof photographic support comprising a paper sheet coated with a polyolefin on both surfaces thereof, in which the paper sheet is sized with a combination of an alkylketene dimer, a cationic polyacrylamide and an anionic polyacrylamide, the alkylketene dimer being present in an amount of 0.2 to 3.0% by weight and the total amount of cationic polyacrylamide and anionic polyacrylamide being 0.5 to 4.0% by weight, all percent by weight being based on the weight of the absolutely dried pulp constituting the paper sheet.
Claim 2
Dependent Claim
85 words
A water-proof photographic support comprising a paper sheet coated with a polyolefin on both surfaces thereof, in which the paper sheet is sized with a combination of an alkylketene dimer, a cationic polyacrylamide and an anionic polyacrylamide, the alkylketene dimer being present in an amount of 0.2 to 3.0% by weight and the total amount of cationic polyacrylamide and anionic polyacrylamide being 0.5 to 4.0% by weight, all percent by weight being based on the weight of the absolutely dried pulp constituting the paper sheet.
Claim 3
Dependent Claim
31 words
The water-proof photographic support as claimed in claim 1, in which the proportion of the cationic polyacrylamide against the anionic polyacrylamide is in the range of 1/4 to 4/1 by weight.
Claim 4
Dependent Claim
22 words
The water-proof photographic support as claimed in claim 1, in which the alkylketene dimer has an alkyl group containing 8-30 carbon atoms.
Claim 5
Dependent Claim
22 words
The water-proof photographic support as claimed in claim 1, in which the alkylketene dimer has an alkyl group containing 12-18 carbon atoms.
Claim 6
Dependent Claim
23 words
The water-proof photographic support as claimed in claim 1, in which the cationic polyacrylamide has the molecular weight ranging from 100,000 to 2,000,000.
Claim 7
Dependent Claim
23 words
The water-proof photographic support as claimed in claim 1, in which the cationic polyacrylamide has the molecular weight ranging from 500,000 to 1,000,000.
Claim 8
Dependent Claim
49 words
The water-proof photographic support as claimed in claim 1, in which the cationic polyacrylamide is selected from the group consisting of a Mannich modification product of polyacrylamide, a Hofmann degradation product of polyacrylamide, a reaction product between polyacrylamide and polyethyleneimine, and a copolymer of acrylamide with a cationic monomer.
Claim 9
Dependent Claim
23 words
The water-proof photographic support as claimed in claim 1, in which the anionic polyacrylamide has the molecular weight ranging from 100,000 to 2,000,000.
Claim 10
Dependent Claim
23 words
The water-proof photographic support as claimed in claim 1, in which the anionic polyacrylamide has the molecular weight ranging from 500,000 to 1,000,000.
Claim 11
Dependent Claim
50 words
The water-proof photographic support as claimed in claim 1, in which the anionic polyacrylamide is selected from the group consisting of a partially hydrolyzed product of polyacrylamide, an acrylamide-acrylic acid copolymer, an acrylamide-methacrylic acid copolymer, an acrylamide-maleic anhydride copolymer, an acrylamide-acrylic acid-acrylonitrile copolymer, and an acrylamide-acrylic acid-acrylic acid ester copolymer.
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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |