US3657005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic record medium
Assignee: Clevite Corp
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Filing: 1967-12-29
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Granted: 1972-04-18
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Expires: 1987-12-29
Abstract
Abstract For use in an electrostatic recording system with voltage charging apparatus having charging electrodes, an electrographic record medium is provided having spacer means, a portion of which projects above the outer surface of a dielectric layer of the record medium. The spacer means space the outer surface of the dielectric layer from the charging electrodes during the voltage charging of a defined area of the outer surface of the dielectric layer.
Inventors
- 👤 Arling Dix Brown Jr
- 👤 John Blumenthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:08
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/325; G03G5/00; G03G5/02; G03G5/0202
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
36 words
An electrographic record medium as in claim 1, wherein the spacer means are alterations of said surface of said dielectric and which project from 0.05 to 0.4 mil above said outer surface of said dielectric layer.
Claim 2
Dependent Claim
30 words
An electrographic record medium as in claim 1, wherein said spacer means are selected from the group of granular particles consisting of starch, glass shot, refractory particles, and plastic particles.
Claim 3
Dependent Claim
18 words
An electrographic record medium as in claim 3, wherein said spacer means are fixed to said dielectric layer.
Claim 4
Dependent Claim
18 words
An electrographic record medium as in claim 3, wherein said spacer means are embedded in said dielectric layer.
Claim 5
Dependent Claim
26 words
An electrographic record medium as in claim 1, wherein at least 80 percent of said outer surface of said dielectric is established at a controlled space.
Claim 6
Dependent Claim
52 words
An electrographic record medium as in claim 1, wherein said spacer means having a distribution on said medium of 1 to 10 spacer means per 100 sq. mil of surface area of said medium and spacing said head from said surface of said dielectric during the pulse voltage charging of said surface.
References Cited (Backward Citations)
US3097964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |