US4331508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic support
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1981-07-06
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Granted: 1982-05-25
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Expires: 2001-07-06
Abstract
Abstract A photographic support comprises a paper coated on both sides with polyethylene resin film. To impart the paper a desirable stiffness and improved cutting property, polyvinyl alcohol fibers which are neither heat-treated nor acetalized, in 5-20 parts by weight, are mixed to 100 parts by weight of woodpulp fibers when the paper is formed.
Inventors
- 👤 Masao Miyama
- 👤 You Kusama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:48
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/12; D21H13/16; 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
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
173 words
A photographic support which comprises a paper made from woodpulp fibers and containing a sizing agent and a strength reinforcing agent, and a polyethylene resin coated thereon, the bone dry weight ratio of said strength reinforcing agent to said sizing agent being 1.8-4.0 to 1 and the amount of the sizing agent being 0.3-1.0% by weight of the woodpulp fibers, wherein said polyethylene resin coated on the back side of the paper contains 35-80% by weight of low-density polyethylene, wherein the paper stock contains polyvinyl alcohol fibers in an amount of 5-20% of the oven-dry weight based on the woodpulp fibers, said polyvinyl alcohol fibers maintaining a fibrous shape and adhering to the woodpulp fibers and wherein the woodpulp fibers constituting the paper stock have fractionation characteristics in accordance with the fractionation method specified in JISP8207 such that 5-40% is retained by the first wire sieve cloth having a sieve opening of 710 μm and more than 35% is retained by the second wire sieve cloth having a sieve opening of 350 μm.
Claim 2
Dependent Claim
173 words
A photographic support which comprises a paper made from woodpulp fibers and containing a sizing agent and a strength reinforcing agent, and a polyethylene resin coated thereon, the bone dry weight ratio of said strength reinforcing agent to said sizing agent being 1.8-4.0 to 1 and the amount of the sizing agent being 0.3-1.0% by weight of the woodpulp fibers, wherein said polyethylene resin coated on the back side of the paper contains 35-80% by weight of low-density polyethylene, wherein the paper stock contains polyvinyl alcohol fibers in an amount of 5-20% of the oven-dry weight based on the woodpulp fibers, said polyvinyl alcohol fibers maintaining a fibrous shape and adhering to the woodpulp fibers and wherein the woodpulp fibers constituting the paper stock have fractionation characteristics in accordance with the fractionation method specified in JISP8207 such that 5-40% is retained by the first wire sieve cloth having a sieve opening of 710 μm and more than 35% is retained by the second wire sieve cloth having a sieve opening of 350 μm.
Claim 3
Dependent Claim
29 words
A photographic support according to claim 1 wherein the paper stock contains polyvinyl alcohol fibers in an amount of 8-15% of the oven-dry weight based on the woodpulp fibers.
Claim 4
Dependent Claim
41 words
A photographic support according to claim 1 wherein the woodpulp fibers constituting the paper stock have fractionation characteristics in accordance with the fractionation method specified in JISP8207 such that 15-30% is retained by the first wire sieve opening of 710 μm.
Claim 5
Dependent Claim
61 words
A photographic support according to claim 3, wherein woodpulp fibers constituting the paper stock have fractionation characteristics in accordance with the fractionation method specified in JISP8207 such that 15% is retained by the first wire sieve cloth having a sieve opening of 710 μm and 40% is retained by the second wire sieve cloth having a sieve opening of 350 μm.
Claim 6
Dependent Claim
26 words
A photographic support according to claim 1, wherein said polyethylene resin coated on the back side of the paper contains 40-70% by weight of low-density polyethylene.
Claim 7
Dependent Claim
26 words
A photographic support according to claim 1 wherein the polyethylene resin coated on the emulsion side of the paper contains 40-70% by weight of low-density polyethylene.
Claim 8
Dependent Claim
22 words
A photographic support according to claim 1 wherein the basis weight of the paper is not more than 160 g/m 2 .
References Cited (Backward Citations)
CA693589A
Cited
US3096231A
Cited
US3592731A
Cited
US3630830A
Cited
US4110155A
Cited
US4188220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |