US4792485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recording sheet
Assignee: Fujifilm Holdings Corp
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Filing: 1988-03-23
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Granted: 1988-12-20
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Expires: 2008-03-23
Abstract
Abstract An electrostatic recording sheet comprising a support provided thereon a conductive layer and a dielectric layer, in this order, with the dielectrics layer containing polypropylene particles with a specified size distribution and exhibiting excellent moisture resistance and high transparency.
Inventors
- 👤 Takeshi Konno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:37
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G5/0208; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/24934; Y10T428/25; Y10T428/254; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
31 words
An electrostatic recording sheet comprising at least a support, a conductive layer provided on the support, and a dielectric layer provided on the conductive layer, said dielectric layer containing polypropylene particles.
Claim 2
Dependent Claim
31 words
An electrostatic recording sheet comprising at least a support, a conductive layer provided on the support, and a dielectric layer provided on the conductive layer, said dielectric layer containing polypropylene particles.
Claim 3
Dependent Claim
53 words
An electrostatic recording sheet as in claim 1, wherein not more than 15 wt % of said polypropylene particles have a particle size of 5 microns or less, and those having a particle size of 13 microns or less amount to not less than 65 wt % of all of the polypropylene particles.
Claim 4
Dependent Claim
17 words
An electrostatic recording sheet as in claim 1, where the support is a paper or a plastic.
Claim 5
Dependent Claim
39 words
An electrostatic recording sheet as in claim 3, wherein the polypropylene particles contained in the dielectric layer are contained in an amount of from 0.3 wt % to 7.5 wt % by weight of solids in the dielectric layer.
Claim 6
Dependent Claim
18 words
An electrostatic recording sheet as in claim 1, wherein the polypropylene particles are dispersed in the dielectric layer.
Claim 7
Dependent Claim
31 words
An electrostatic recording sheet as in claim 1, wherein 70 wt % or more of the total weight of the polypropylene particles are of a diameter of 5 to 13 microns.
Claim 8
Dependent Claim
39 words
An electrostatic recording sheet as in claim 1, wherein the polypropylene particles contained in the dielectric layer are contained in an amount of from 0.3 wt % to 12.5 wt % by weight of solids in the dielectric layer.
Claim 9
Dependent Claim
20 words
An electrostatic recording sheet as in claim 1, wherein the dielectric layer is comprised of an organic solvent soluble polymer.
References Cited (Backward Citations)
US3620831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |