Patent US4239338A successfully refreshed from Google Patents.
US4239338A
Expired / Lapsed
US
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Silver halide optical information storage media
Assignee: Coltec North Carolina Inc
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Filing: 1979-10-22
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Granted: 1980-12-16
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Expires: 1999-10-22
Abstract
Abstract Optically bleachable multilayer films containing additively colored silver chloride which exhibit high infrared transmittance and good bleaching sensitivity, and optical information storage media incorporating such films, are described.
Inventors
- 👤 Nicholas F. Borrelli
- 👤 Peter L. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/496; G03C1/4965; G03C7/00; G03C7/02; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/918; Y10S430/00; Y10S430/133
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
57 words
A visibly absorbing, optically bleachable inorganic film comprising multiple polycrystalline silver chloride layers containing crystals of additively colored silver chloride, having a thickness not exceeding about 2 microns, which exhibits, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
Claim 2
Dependent Claim
57 words
A visibly absorbing, optically bleachable inorganic film comprising multiple polycrystalline silver chloride layers containing crystals of additively colored silver chloride, having a thickness not exceeding about 2 microns, which exhibits, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
Claim 3
Dependent Claim
63 words
A multilayer photosensitive inorganic film having a thickness not exceeding about 2 microns and comprising alternating layers of PbO and AgCl, including at least three AgCl layers comprising additively colored AgCl crystals, wherein the film has, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
Claim 4
Dependent Claim
63 words
A multilayer photosensitive inorganic film having a thickness not exceeding about 2 microns and comprising alternating layers of PbO and AgCl, including at least three AgCl layers comprising additively colored AgCl crystals, wherein the film has, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
Claim 5
Dependent Claim
17 words
A film in accordance with claim 2 which has a thickness in the range of 0.5-2 microns.
Claim 6
Dependent Claim
24 words
A film in accordance with claim 3 which has, in the optically unbleached state, a transmittance at 8500 A of at least about 0.7.
Claim 7
Dependent Claim
77 words
A optical information storage medium which includes a visibly absorbing, optically bleachable inorganic film disposed on a support for the film, said film: (a) comprising multiple polycrystalline silver chloride layers which comprise crystals of additively colored silver chloride; (b) having a thickness not exceeding about 2 microns; and (c) having, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
Claim 8
Dependent Claim
77 words
A optical information storage medium which includes a visibly absorbing, optically bleachable inorganic film disposed on a support for the film, said film: (a) comprising multiple polycrystalline silver chloride layers which comprise crystals of additively colored silver chloride; (b) having a thickness not exceeding about 2 microns; and (c) having, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
Claim 9
Dependent Claim
77 words
An optical information storage medium which includes a multilayer photosensitive inorganic film disposed on a film support, said film having a thickness not exceeding about 2 microns, comprising alternating layers of PbO and AgCl, and including at least three AgCl layers comprising additively colored AgCl crystals, wherein the film has, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
Claim 10
Dependent Claim
77 words
An optical information storage medium which includes a multilayer photosensitive inorganic film disposed on a film support, said film having a thickness not exceeding about 2 microns, comprising alternating layers of PbO and AgCl, and including at least three AgCl layers comprising additively colored AgCl crystals, wherein the film has, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
Claim 11
Dependent Claim
19 words
An optical information storage medium in accordance with claim 6 wherein the film support is a transparent glass sheet.
Claim 12
Dependent Claim
18 words
An optical information storage medium in accordance with claim 6 wherein the film support is a light-reflecting support.
Claim 13
Dependent Claim
31 words
An optical information storage medium in accordance with claim 6 wherein the film support consists of a supporting member comprising a light reflecting layer positioned between the member and the film.
Claim 14
Dependent Claim
19 words
An optical information storage medium in accordance with claim 9 wherein the light-reflecting layer consists of a metallic film.
Claim 15
Dependent Claim
27 words
An optical information storage medium in accordance with claim 9 wherein the film support further comprises a barrier layer positioned between said light-reflecting layer and said film.
Claim 16
Dependent Claim
21 words
An optical information storage medium in accordance with claim 11 wherein the barrier layer consists of a transparent metal oxide film.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |