US4046457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric film base carrying fluoropolymer anti-reflection coating
Assignee: Polaroid Corp
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Filing: 1975-08-06
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Granted: 1977-09-06
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Expires: 1995-08-06
Abstract
Abstract Transparent elements useful as supports for photographic image-carrying and/or image-recording layers are provided comprising a polymeric film base having an anti-reflection coating on one surface. Image-carrying and/or image-recording layers may be coated on the opposed surface. Such transparent supports are particularly useful in photographic products wherein the final image is formed by multicolor diffusion transfer processes using dye developers or other image dye-providing materials. In the preferred embodiments, the photographic image is an integral negative-positive reflection print. Where photoexposure is effected through a transparent support, e.g., the transparent support through which the final image is viewed, provision of an anti-reflection coating on said support and effecting photoexposure therethrough will permit more effective recording of light passing through the camera lens. The polymeric film base of the transparent element has an index of refraction of at least 1.6, and the anti-reflection coating comprises a fluorinated polymer and has an optical thickness of a quarter wave.
Inventors
- 👤 Edwin H. Land
- 👤 Stanley M. Bloom
- 👤 Howard G. Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C8/00; G03C8/42; G03C8/52; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/261
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
78 words
A transparent element comprising an organic polymeric film base having an index of refraction of at least 1.6, said polymeric film base having coated directly on at least one surface thereof an anti-reflection coating comprising a fluorinated polymer, said anti-reflection coating having an index of refraction of about 1.3 to 1.45 and a quarter wave optical thickness, the index of refraction of said anti-reflection coating being at least 0.2 less than that of said organic polymeric film base.
Claim 2
Dependent Claim
78 words
A transparent element comprising an organic polymeric film base having an index of refraction of at least 1.6, said polymeric film base having coated directly on at least one surface thereof an anti-reflection coating comprising a fluorinated polymer, said anti-reflection coating having an index of refraction of about 1.3 to 1.45 and a quarter wave optical thickness, the index of refraction of said anti-reflection coating being at least 0.2 less than that of said organic polymeric film base.
Claim 3
Dependent Claim
30 words
A transparent element as defined in claim 1 wherein said anti-reflection coating is present on one surface and the other surface of said polymeric film base carries a subbing layer.
Claim 4
Dependent Claim
17 words
A transparent element as defined in claim 1 wherein said organic polymeric film base is a polyester.
Claim 5
Dependent Claim
14 words
A transparent element as defined in claim 3 wherein said polyester is polyethylene terephthalate.
Claim 6
Dependent Claim
24 words
A transparent element as defined in claim 1 wherein each surface of said organic polymeric film base has coated directly thereon said anti-reflection coating.
Claim 7
Dependent Claim
23 words
A transparent element as defined in claim 1 wherein said organic polymeric film base has a thickness of about 2 to 10 mils.
Claim 8
Dependent Claim
17 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes a vinylidene fluoride copolymer.
Claim 9
Dependent Claim
20 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and chlorotrifluoroethylene.
Claim 10
Dependent Claim
20 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and tetrafluoroethylene.
Claim 11
Dependent Claim
20 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes a copolymer of vinylidene fluoride and hexafluoropropylene.
Claim 12
Dependent Claim
15 words
A transparent element as defined in claim 1 wherein said anti-reflection coating includes polymethyl methacrylate.
Claim 13
Dependent Claim
23 words
A transparent element as defined in claim 1 wherein said anti-reflection coating has an optical thickness of about 0.08 to about 0.2 micron.
Claim 14
Dependent Claim
23 words
A transparent element as defined in claim 1 wherein said anti-reflection coating has a physical thickness of about 0.09 to about 0.11 micron.
Claim 15
Dependent Claim
76 words
A transparent element comprising a polyethylene terephthalate film base, said film base having an index of refraction of at least 1.6 and having coated directly on one surface thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.09 to about 0.11 micron, and an index of refraction at least about 0.20 less than the index of refraction of said polyethylene terephthalate.
Claim 16
Dependent Claim
76 words
A transparent element comprising a polyethylene terephthalate film base, said film base having an index of refraction of at least 1.6 and having coated directly on one surface thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.09 to about 0.11 micron, and an index of refraction at least about 0.20 less than the index of refraction of said polyethylene terephthalate.
Claim 17
Dependent Claim
33 words
A transparent element as defined in claim 14 wherein said polyethylene terephthalate includes a small quantity of a pigment effective to control light-piping by internal reflection of light incident upon an edge thereof.
Claim 18
Dependent Claim
16 words
A transparent element as defined in claim 14 wherein said optical thickness is about 1400 Angstroms.
Claim 19
Dependent Claim
76 words
A transparent element comprising a polyethylene terephthalate film base, said film base having an index of refraction of at least 1.6 and having coated directly on both surfaces thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.09 to about 0.11 micron, and an index of refraction at least about 0.20 less than the index of refraction of said polyethylene terephthalate.
Claim 20
Dependent Claim
76 words
A transparent element comprising a polyethylene terephthalate film base, said film base having an index of refraction of at least 1.6 and having coated directly on both surfaces thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.09 to about 0.11 micron, and an index of refraction at least about 0.20 less than the index of refraction of said polyethylene terephthalate.
Claim 21
Independent Claim
96 words
The method which comprises coating directly on an organic polymeric self-supporting film, having an index of refraction of at least 1.6, a solution comprising an organic solvent and at least one fluorinated polymer dissolved therein at a coverage which will provide a fluorinated polymer layer having a quarter wave optical dry thickness, and drying said coating by evaporating said solvent at an elevated temperature, the index of refraction of said coating being about 1.3 to 1.45 and at least 0.2 less than that of said organic polymeric film, said coating solution being applied at room temperature.
Claim 22
Independent Claim
96 words
The method which comprises coating directly on an organic polymeric self-supporting film, having an index of refraction of at least 1.6, a solution comprising an organic solvent and at least one fluorinated polymer dissolved therein at a coverage which will provide a fluorinated polymer layer having a quarter wave optical dry thickness, and drying said coating by evaporating said solvent at an elevated temperature, the index of refraction of said coating being about 1.3 to 1.45 and at least 0.2 less than that of said organic polymeric film, said coating solution being applied at room temperature.
Claim 23
Dependent Claim
15 words
The method defined in claim 18 wherein said organic polymeric self-supporting film is a polyester.
Claim 24
Dependent Claim
13 words
The method as defined in claim 19 wherein said polyester is polyethylene terephthalate.
Claim 25
Dependent Claim
22 words
The method as defined in claim 18 wherein said self-supporting organic polymeric film has a thickness of about 2 to 10 mils.
Claim 26
Dependent Claim
16 words
The method as defined in claim 18 wherein said coating solution includes a vinylidene fluoride copolymer.
Claim 27
Dependent Claim
19 words
The method as defined in claim 18 wherein said coating solution includes a copolymer of vinylidene fluoride and chlorotrifluoroethylene.
Claim 28
Dependent Claim
19 words
The method as defined in claim 18 wherein said coating solution includes a copolymer of vinylidene fluoride and tetrafluoroethylene.
Claim 29
Dependent Claim
19 words
The method as defined in claim 18 wherein said coating solution includes a copolymer of vinylidene fluoride and hexafluoropropylene.
Claim 30
Dependent Claim
14 words
The method as defined in claim 18 wherein said coating solution includes polymethyl methacrylate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |