US4173480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic sheet with synthetic hectorite antistatic additive as sizing or backcoat
Assignee: Curtis Fine Paper Holdings Ltd
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Filing: 1978-04-11
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Granted: 1979-11-06
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Expires: 1998-04-11
Abstract
Abstract Sheet material having a polymeric surface for receiving a photographic image, the material comprising an antistatic agent which is a synthetic hectorite clay having a layered structure the layers of which are electrically charged.
Inventors
- 👤 Antony I. Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:31
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/85; G03C1/853; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
A photographic sheet material element, adapted for carrying a radiation-sensitive layer for receiving a photographic image, which comprises a support having incorporated therewith an antistatic additive composition as a sizing or a backcoat, said antistatic additive composition comprising synthetic hectorite clay having a layered structure, the layers of which are electrically charged and said layers being magnesium silicate lattice structure in which magnesium ions are bound in octadhedral relationship with hydroxyl ions.
Claim 2
Dependent Claim
72 words
A photographic sheet material element, adapted for carrying a radiation-sensitive layer for receiving a photographic image, which comprises a support having incorporated therewith an antistatic additive composition as a sizing or a backcoat, said antistatic additive composition comprising synthetic hectorite clay having a layered structure, the layers of which are electrically charged and said layers being magnesium silicate lattice structure in which magnesium ions are bound in octadhedral relationship with hydroxyl ions.
Claim 3
Dependent Claim
30 words
In a photographic sheet material element as defined in claim 1 wherein said support is paper and said antistatic additive composition is present as a size coat on said paper.
Claim 4
Dependent Claim
30 words
In a photographic element as defined in claim 2 wherein said support is paper having a layer of polyolefin available for carrying a radiation-sensitive layer for receiving a photographic image.
Claim 5
Dependent Claim
14 words
In a photographic element as defined in claim 3 wherein said polyolefin is polyethylene.
Claim 6
Dependent Claim
26 words
In a photographic element as defined in claim 1 wherein said support comprises a sheet of paper having a layer of polyolefin on each side thereof.
Claim 7
Dependent Claim
42 words
In a photographic element as defined in claim 5 wherein one of said layers of polyolefin has, in turn, a layer of said antistatic additive composition thereon, the remaining layer being available for carrying a radiation-sensitive layer for receiving a photographic image.
Claim 8
Dependent Claim
16 words
In a photographic element as defined in claim 2 wherein said size also contains sodium sulfate.
Claim 9
Dependent Claim
18 words
In a photographic element as defined in claim 6 wherein said antistatic additive composition also contains sodium sulfate.
Claim 10
Dependent Claim
17 words
In a photographic element as defined in claim 6 wherein said antistatic layer also contains particulate silica.
Claim 11
Dependent Claim
14 words
In a photographic element as defined in claim 6 wherein said polyolefin is polyethylene.
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) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |