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Patent US4165153A successfully refreshed from Google Patents.
US4165153A
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Translucent screen
Assignee: Polaroid Corp
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Filing: 1978-04-25
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Granted: 1979-08-21
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Expires: 1998-04-25
Abstract
Abstract Translucent screens are provided comprising a dispersion of low index of refraction particles dispersed in a continuous polymeric phase of a higher index of refraction material.
Inventors
- 👤 Edwin H. Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:56
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
58 words
A translucent screen comprising a dispersion of particles as a discontinuous phase in a polymeric continuous phase, said continuous phase having a higher index of refraction than said particles, said particles and said continuous phase having indices of refraction differing by at least 0.10, said particles having nonplanar surfaces and having overall diameters not exceeding about 5 microns.
Claim 2
Dependent Claim
58 words
A translucent screen comprising a dispersion of particles as a discontinuous phase in a polymeric continuous phase, said continuous phase having a higher index of refraction than said particles, said particles and said continuous phase having indices of refraction differing by at least 0.10, said particles having nonplanar surfaces and having overall diameters not exceeding about 5 microns.
Claim 3
Dependent Claim
14 words
A translucent screen as defined in claim 1 wherein said particles are polytetrafluoroethylene particles.
Claim 4
Dependent Claim
26 words
A translucent screen as defined in claim 2 wherein said polytetrafluoroethylene particles have a diameter of about 1 to 2 microns and are flake-like in configuration.
Claim 5
Dependent Claim
20 words
A translucent screen as defined in claim 1 wherein said polymeric continuous phase comprises a half-butyl ester of poly(ethylene/maleic anhydride).
Claim 6
Dependent Claim
16 words
A translucent screen as defined in claim 1 wherein said polymeric continuous phase comprises polyvinyl butyral.
Claim 7
Dependent Claim
16 words
A translucent screen as defined in claim 1 wherein said polymeric continuous phase is ethyl cellulose.
Claim 8
Dependent Claim
35 words
A translucent screen as defined in claim 1 wherein said particles are polytetrafluoroethylene particles having a diameter of about 1 to 2 microns and said polymeric continuous phase comprises a half-butyl ester of poly(ethylene/maleic anhydride).
Claim 9
Dependent Claim
19 words
A translucent screen as defined in claim 1 wherein the surfaces of said screen are substantially flat and parallel.
Claim 10
Dependent Claim
19 words
A translucent screen as defined in claim 8 wherein at least one of said surfaces carries an anti-reflection coating.
Claim 11
Dependent Claim
15 words
A translucent screen as defined in claim 9 having the configuration of a Fresnel lens.
Claim 12
Dependent Claim
16 words
A translucent screen as defined in claim 1 including a small quantity of a light-absorbing material.
Claim 13
Dependent Claim
15 words
A translucent screen as defined in claim 11 wherein said light-absorbing material is carbon black.
Claim 14
Dependent Claim
17 words
A translucent screen as defined in claim 1 wherein said dispersion is carried by a transparent support.
Claim 15
Dependent Claim
20 words
A translucent screen as defined in claim 13 wherein the other surface of said transparent support carries an anti-reflection coating.
Claim 16
Dependent Claim
15 words
A translucent screen as defined in claim 14 wherein said transparent support is a polyester.
References Cited (Backward Citations)
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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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |