Patent US3874878A successfully refreshed from Google Patents.
US3874878A
Expired / Lapsed
US
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Photographic article with composite oxidation protected anti-static layer
Assignee: Eastman Kodak Co
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Filing: 1972-05-22
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Granted: 1975-04-01
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Expires: 1992-05-22
Abstract
Abstract A photographic article having a dielectric support and a hydrophilic colloid coating is protected against the accumulation of a static electrical charge and, optionally non-adhesion of the colloid coating by the provision of a composite layer including a conductive layer portion having a surface resistivity of less than 1012 ohms per square and a protective metal oxide layer portion overlying a major surface of the composite layer portion remote from the support. A second protective metal oxide layer portion may be interposed between the support and the conductive layer portion.
Inventors
- 👤 Arthur A Rasch
- 👤 Wilbur C Hodges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:25
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/853; G03C1/91; Y; Y10; Y10S; Y10S430/00; Y10S430/155
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
IN A PHOTOGRAPHIC ARTICLE COMPRISING A RADIATION-SENSITIVE MATERIAL, A FLEXIBLE HYDROPHOBIC POLYESTER FILM SUPPORT, HYDROPHILIC COLLOID COATING AND A COMPOSITE SUBBING LAYER INTERPOSED BETWEEN AND BONDED TO SAID FILM AND SAID HYDROPHILIC COLLOID COATING, THE IMPROVEMENT IN WHICH SAID SUBBING LAYER IS VAPOR DEPOSITED AND BINDERLESS AND COMPRISES AN ELECTRICALLY CONDUCTIVE LAYER PORTION EXHIBITING A SURFACE RESISTIVITY OF LESS THAN 10**12 OHMS PER SQUARE WHICH IS CAPABLE OF OXIDATION TO LESS CONDUCTIVE STATE AND A PROTECTIVE INORGANIC OXIDE LAYER PORTION WHICH CONSISTS ESSENTIALLY OF SAID INORGANIC OXIDE BONDED TO A MAJOR SURFACE REMOTE FROM SAID SUPPORT OF SAID ELECTRICALLY CONDUCTIVE LAYER PORTION TO RETARD OXIDATION THEREOF; SAID COMPOSITE SUBBING LAYER HAVING A THICKNESS OF LESS THAN 100 ANGSTROMS AND AN OPTICAL DENSITY OF AT MOST ABOUT 0.5.
Claim 2
Dependent Claim
127 words
IN A PHOTOGRAPHIC ARTICLE COMPRISING A RADIATION-SENSITIVE MATERIAL, A FLEXIBLE HYDROPHOBIC POLYESTER FILM SUPPORT, HYDROPHILIC COLLOID COATING AND A COMPOSITE SUBBING LAYER INTERPOSED BETWEEN AND BONDED TO SAID FILM AND SAID HYDROPHILIC COLLOID COATING, THE IMPROVEMENT IN WHICH SAID SUBBING LAYER IS VAPOR DEPOSITED AND BINDERLESS AND COMPRISES AN ELECTRICALLY CONDUCTIVE LAYER PORTION EXHIBITING A SURFACE RESISTIVITY OF LESS THAN 10**12 OHMS PER SQUARE WHICH IS CAPABLE OF OXIDATION TO LESS CONDUCTIVE STATE AND A PROTECTIVE INORGANIC OXIDE LAYER PORTION WHICH CONSISTS ESSENTIALLY OF SAID INORGANIC OXIDE BONDED TO A MAJOR SURFACE REMOTE FROM SAID SUPPORT OF SAID ELECTRICALLY CONDUCTIVE LAYER PORTION TO RETARD OXIDATION THEREOF; SAID COMPOSITE SUBBING LAYER HAVING A THICKNESS OF LESS THAN 100 ANGSTROMS AND AN OPTICAL DENSITY OF AT MOST ABOUT 0.5.
Claim 3
Dependent Claim
127 words
In a photographic article comprising a radiation-sensitive material, a flexible hydrophobic polyester film support, a gelatin layer and a composite subbing layer interposed between and bonded to said film and said gelatin layer, the improvement in which said subbing layer is vapor deposited and binderless and comprises an electrically conductive layer portion exhibiting a surface resistivity of less than 1012 ohms per square which is capable of oxidation to a less conductive state and a protective inorganic oxide layer portion which consists essentially of said inorganic oxide bonded to a major surface remote from said support of said electrically conductive layer portion to retard oxidation thereof; said composite subbing layer having a thickness of less than 100 angstroms and an optical density of at most about 0.5.
Claim 4
Dependent Claim
127 words
In a photographic article comprising a radiation-sensitive material, a flexible hydrophobic polyester film support, a gelatin layer and a composite subbing layer interposed between and bonded to said film and said gelatin layer, the improvement in which said subbing layer is vapor deposited and binderless and comprises an electrically conductive layer portion exhibiting a surface resistivity of less than 1012 ohms per square which is capable of oxidation to a less conductive state and a protective inorganic oxide layer portion which consists essentially of said inorganic oxide bonded to a major surface remote from said support of said electrically conductive layer portion to retard oxidation thereof; said composite subbing layer having a thickness of less than 100 angstroms and an optical density of at most about 0.5.
Claim 5
Dependent Claim
15 words
A photographic article according to claim 2, in which said film support is polyethylene terephthalate.
Claim 6
Dependent Claim
16 words
A photographic article according to claim 2, in which saiD radiation-sensitive material is a silver salt.
Claim 7
Dependent Claim
28 words
A photographic article according to claim 2, in which said support is polyethylene terephthalate, said radiation-sensitive material is a silver halide and said inorganic oxide is silicon oxide.
Claim 8
Dependent Claim
15 words
A photographic article according to claim 5, in which said silver halide is silver bromochloride.
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |