US4264707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive photographic materials with improved antistatic layers
Assignee: Konica Minolta Inc
•
Filing: 1978-10-13
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Granted: 1981-04-28
•
Expires: 1998-10-13
Abstract
Abstract A photographic material comprising a light sensitive photographic layer and a support having thereon in order a layer containing alumina sol including colloidal particles and an electrolyte and a layer containing a hydrophobic polymer.
Inventors
- 👤 Takahiro Uozumi
- 👤 Tohru Kobayashi
- 👤 Koichi Nagayasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:49
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/853; G03C1/95
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
A photographic material comprising a support having on one side (i) an alumina sol-containing layer comprising alumina-containing colloidal particles and an electrolyte, and (ii) a layer containing a hydrophobic polymer coated on said alumina sol-containing layer, and having a light-sensitive photographic layer on the other side of said support.
Claim 2
Dependent Claim
49 words
A photographic material comprising a support having on one side (i) an alumina sol-containing layer comprising alumina-containing colloidal particles and an electrolyte, and (ii) a layer containing a hydrophobic polymer coated on said alumina sol-containing layer, and having a light-sensitive photographic layer on the other side of said support.
Claim 3
Dependent Claim
20 words
The photographic material of claim 1, wherein the average grain size of said colloidal particles ranges from 0.1 to 0.02μ.
Claim 4
Dependent Claim
22 words
The photographic material of claim 1, wherein said electrolyte is an inorganic acid, an aliphatic carboxylic acid or an aromatic carboxylic acid.
Claim 5
Dependent Claim
17 words
The photographic material of claim 1, wherein said hydrophobic polymer is a cellulose ester or an acetal.
Claim 6
Dependent Claim
29 words
The photographic material of claim 2, wherein said aluminia sol-containing layer contains said colloidal particles in an amount between 5 and 500 mg. per square meter of said layer.
Claim 7
Dependent Claim
29 words
The photographic material of claim 1, wherein said alumina sol-containing layer contains said colloidal particles in an amount between 5 and 500 mg. per square meter of said layer.
Claim 8
Dependent Claim
36 words
The photographic material of claim 2 or claim 1, wherein said alumina sol-containing layer contains said electrolyte in an amount between 10 -4 and 10 -2 mol of electrolyte per gram of alumina in said layer.
Claim 9
Dependent Claim
33 words
The photographic material of claim 6, wherein said alumina sol-containing layer contains said electrolyte in an amount between 10 -4 and 10 -2 mol of electrolyte per gram of alumina in said layer.
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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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |