Patent US3639162A successfully refreshed from Google Patents.
US3639162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ctroconductive coating
Assignee: Amicon Corp
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Filing: 1966-10-20
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Granted: 1972-02-01
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Expires: 1986-10-20
Abstract
Abstract Paper having a surface coating of exfoliated three-layer clay exhibiting a surface conductivity of 108-1010 ohms/sq. at relative humidities from 12-15 percent may be used for making a copy sheet for electrophotography by providing an overcoating of zinc oxide. An aqueous dispersion of exfoliated three-layer clay together with water soluble electroconductive inorganic compound is described.
Inventors
- 👤 Harris J Bixler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:09
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/101
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
The process of making copy sheet for use in electrophotography which comprises fibrous sheet material having an electrically conducted coated surface, which process comprises the steps of preparing an aqueous dispersion containing 0.5 to 10 percent by weight of exfoliated three-layer clay, coating the surface of said sheet with said dispersion, drying said coating to produce a coated sheet having a surface conductivity in the approximate range of 108-1010 ohms/sq. at relative humidities from 12-15 percent, then applying a photoconductive zinc oxide coating over said electrically conductive coating.
Claim 2
Dependent Claim
80 words
A fibrous sheet material having electrically conductive surface coating comprising exfoliated three-layer clay, selected from the class consisting of bentonite, vermiculite and pyrophyllite, said coating also including a water-soluble electroconductive inorganic compound selected from the class of hygroscopic lithium, calcium and magnesium compounds, said compound being present in an amount from about 5 to 15 percent by weight of said clay, said coating having a surface resistivity in the approximate range of 108-1010 ohms/sq. at relative humidities from 12-15 percent.
Claim 3
Dependent Claim
56 words
A copy sheet for use in electrophotography comprising a fibrous sheet material having electrically conductive surface coating comprising exfoliated three-layer clay, said coating having a surface resistivity in the approximate range of 108-1010 ohms/sq. at relative humidities from 12-15 percent, said sheet having an overcoating comprising photoconductive zinc oxide on top of said electrically conductive coating.
Claim 4
Dependent Claim
37 words
A copy sheet for use in electrophotography as claimed in claim 4 in which the electrically conductive surface coating includes a water-soluble electroconductive inorganic compound in an amount up to 50 percent by weight of the clay.
Claim 5
Dependent Claim
27 words
A copy sheet for use in electrophotography as claimed in claim 4 in which the clay is selected from the class consisting of bentonite, vermiculite and pyrophyllite.
Claim 6
Dependent Claim
27 words
A copy sheet for use in electrophotography as claimed in claim 6 in which the weight of the electrically conductive surface coating is 0.5 to 5 lb./ream.
Claim 7
Dependent Claim
54 words
A copy sheet for use in electrophotography as claimed in claim 6 in which the electrically conductive surface coating includes a water-soluble electroconductive inorganic compound selected from the class of hygroscopic lithium, calcium and magnesium compounds, said compound being present in an amount from about 5 to 15 percent by weight of said clay.
Claim 8
Dependent Claim
37 words
A copy sheet for use in electrophotography as claimed in claim 6 in which the fibrous sheet material is paper and the electrically conductive surface coating comprises sodium bentonite in an amount from 1 to 4 lb./ream.
Claim 9
Dependent Claim
37 words
A copy sheet for use in electrophotography as claimed in claim 6 in which the fibrous sheet material is paper and the electrically conductive surface coating comprises lithium bentonite in an amount from 1 to 4 lb./ream.
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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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |