Patent US3609000A successfully refreshed from Google Patents.
US3609000A
Expired / Lapsed
US
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Transmission-type projection screen
Assignee: Fujifilm Holdings Corp
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Filing: 1969-09-16
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Granted: 1971-09-28
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Expires: 1989-09-16
Abstract
Abstract A transmission-type projection screen comprising a support having thereon a layer of a binder having microcapsules dispersed therein, said microcapsules containing particles of a material having a refractive index different from that of said binder. The transmission-type projection screen is one wherein the refractive index of said material differs from the refractive index of said binder by a factor of at least 0.02.
Inventors
- 👤 Shizuo Miyano
- 👤 Hirotoshi Endo
- 👤 Asaji Kondo
- 👤 Shingo Ooue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:36
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
68 words
A transmission-type projection screen comprising a support having thereon a layer of a binder having microcapsules dispersed therein, said microcapsules containing particles of a material having a refractive index different from that of said binder, said layer having a thickness of from 10 to 100 microns and the refractive index of said material differing from the refractive index of said binder by a factor of at least 0.02.
Claim 2
Dependent Claim
68 words
A transmission-type projection screen comprising a support having thereon a layer of a binder having microcapsules dispersed therein, said microcapsules containing particles of a material having a refractive index different from that of said binder, said layer having a thickness of from 10 to 100 microns and the refractive index of said material differing from the refractive index of said binder by a factor of at least 0.02.
Claim 3
Dependent Claim
26 words
The transmission-type projection screen as in claim 1, wherein said binder is selected from the group consisting of gelatin, polyvinyl alcohol, sodium alginate and cellulose derivatives.
Claim 4
Dependent Claim
32 words
The transmission-type projection screen as in claim 1, wherein said material contained in said microcapsules is selected from the group consisting of polystyrene, polyvinyl chloride, polymethyl methacrylate and an ethylene-vinyl acetate copolymer.
Claim 5
Dependent Claim
26 words
The transmission-type projection screen as in claim 1, wherein the amount of binder is from one-fifth to 5 times, by weight, the amount of said microscapsules.
Claim 6
Dependent Claim
42 words
The transmission-type projection screen as in claim 1, wherein the amount of said material in said microcapsule is from 0.1 to 10 times, by weight, the amount of the colloid material used to form the film of said microcapsule surrounding said material.
Claim 7
Dependent Claim
20 words
The transmission-type projection screen as in claim 1, wherein the particle size of said microcapsules is less than 50 microns.
Claim 8
Dependent Claim
21 words
The transmission-type projection screen as in claim 6, wherein the particle size of said microcapsules is from 1 to 10 microns.
Claim 9
Dependent Claim
42 words
The transmission-type projection screen as in claim 1, wherein the amount of said material in said microcapsule is from 2 to 4 times, by weight, the amount of the colloid material used to form the film of said microcapsule surrounding said material.
Claim 10
Dependent Claim
21 words
The transmission-type projection screen as in claim 1, wherein the particle size of said microcapsules is from 2 to 6 microns.
Claim 11
Dependent Claim
86 words
A transmission-type projection screen comprising a support having thereon a layer of a binder having microcapsules and fine particles of a first material having a refractive index different from that of said binder dispersed therein, said microcapsules containing particles of a second material having a refractive index different from that of said binder, said layer having a thickness of from 10 to 100 microns and the refractive index of said material differing from the refractive index of said binder by a factor of at least 0.02.
Claim 12
Dependent Claim
86 words
A transmission-type projection screen comprising a support having thereon a layer of a binder having microcapsules and fine particles of a first material having a refractive index different from that of said binder dispersed therein, said microcapsules containing particles of a second material having a refractive index different from that of said binder, said layer having a thickness of from 10 to 100 microns and the refractive index of said material differing from the refractive index of said binder by a factor of at least 0.02.
Claim 13
Dependent Claim
26 words
The transmission-type projection screen as in claim 10, wherein said binder is selected from the group consisting of gelatin, polyvinyl alcohol, sodium alginate and cellulose derivatives.
Claim 14
Dependent Claim
32 words
The transmission-type projection screen as in claim 10, wherein said first material to be dispersed in said binder is selected from the group consisting of silica, calcium carbonate, barium sulfate and starch.
Claim 15
Dependent Claim
33 words
The transmission-type projection screen as in claim 10, wherein said second material contained in said microcapsules is selected from the group consisting of polystyrene, polyvinyl chloride, polymethyl methacrylate and an ethylene-vinyl acetate copolymer.
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |