US4780402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Films of a light sensitive element having a support polyethylene terephthalate containing barium sulfate particles
Assignee: Imperial Chemical Industries Ltd
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Filing: 1987-08-13
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Granted: 1988-10-25
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Expires: 2007-08-13
Abstract
Abstract Light-sensitive imaging materials comprise a white opaque oriented support film of a polyester, e.g. polyethylene terephthalate, containing a high amount of filler particles comprising barium sulphate, i.e. from 5 to 50% by weight, having an average particle size from 0.5 to 10 mu m, and a light-sensitive imaging layer, e.g. a photographic emulsion, applied to the support film.
Inventors
- 👤 Timothy A. Remmington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:44
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/95
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A light sensitive imaging material, which includes an opaque single-ply biaxially oriented and heat set film of polyethylene terephthalate in which particles consisting of barium sulfate are dispersed throughout the film, said particles of barium sulfate being present in an amount in the range of 5 to 25% by weight based on the weight of the polyester terephthalate and having an average particle size in the range of 0.5 to 5 μm, provided that the particle size of 99.9% of the particles does not exceed 50 μm and at least one light-sensitive imaging layer superimposed upon at least one surface of the film support, said film support having a whiteness value of at least 90 and measured by ASTM test E-313-73 and having been biaxially drawn using draw ratios of 3.0:1 to 4.2:1 in each direction.
Claim 2
Dependent Claim
136 words
A light sensitive imaging material, which includes an opaque single-ply biaxially oriented and heat set film of polyethylene terephthalate in which particles consisting of barium sulfate are dispersed throughout the film, said particles of barium sulfate being present in an amount in the range of 5 to 25% by weight based on the weight of the polyester terephthalate and having an average particle size in the range of 0.5 to 5 μm, provided that the particle size of 99.9% of the particles does not exceed 50 μm and at least one light-sensitive imaging layer superimposed upon at least one surface of the film support, said film support having a whiteness value of at least 90 and measured by ASTM test E-313-73 and having been biaxially drawn using draw ratios of 3.0:1 to 4.2:1 in each direction.
Claim 3
Dependent Claim
22 words
A material according to claim 1, in which the barium sulphate particles have an average particle size of down to 0.7 μm.
Claim 4
Dependent Claim
35 words
A material according to claim 1, in which the particles of barium sulphate are present in the film support in an amount of at least 7% by weight based on the weight of the polyester.
Claim 5
Dependent Claim
37 words
A material according to claim 1, in which the particles of barium sulphate are present in the film support in an amount in the range 10 to 25% by weight based on the weight of the polyester.
Claim 6
Dependent Claim
27 words
A material according to claim 4, in which the particles of barium sulphate are present in the film support in an amount of about 20% by weight.
Claim 7
Dependent Claim
21 words
A material according to claim 1, in which the barium sulphate particles have an average particle size of about 1 μm.
Claim 8
Dependent Claim
15 words
A material according to claim 1, in which the film support includes an optical brightener.
Claim 9
Dependent Claim
17 words
A material according to claim 1, in which the light-sensitive imaging layer(s) comprise light-sensitive photographic emulsion layer(s).
Claim 10
Dependent Claim
14 words
A material according to claim 8, in the form of a photographic print material.
References Cited (Backward Citations)
US3154461A
Cited
US3725520A
Cited
US3834928A
Cited
US3853584A
Cited
US3873321A
Cited
US3944699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |