US3892887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making an electrostatic recording medium
Assignee: Kanzaki Paper Manufacturing Co Ltd
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Filing: 1973-03-16
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Granted: 1975-07-01
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Expires: 1993-03-16
Abstract
Abstract In an improved process for making an electrostatic recording medium, the exposed surface of the dielectric recording layer formed on a surface of an electrically conductive substrate is subjected to a scraping treatment with a scraper.
Inventors
- 👤 Kazuo Shibata
- 👤 Takao Matsushita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:04
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G5/0208
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
A PROCESS FOR MAKING AN ELCTROSTATIC RECORDING MEDIUM COMPRISING THE STEPS OF FORMING A DRIED DIELECTRIC RECORDING LAYER ON A SURFACE OF AN ELECTRICALLY CONDUCTIVE SUBSTRATE SELECTED FROM THE GROUP CONSISTING OF PAPER, PLASTIC FILM AND SYNTHETIC PAPER, SAID EIELECTRIC RECORDING LAYER BEING ESSENTIALLY FORMED OF AN INSULATING RESIN MATERIAL, AND SCRAPING THE EXPOSED SURFACE OF SAID DRIED DIELECTRIC RECORDING LAYER BY DRAWING SAME TRANSVERSELY ACROSS AN ELONGATED SCRAPING MEANS WITH CONTACT AREA HAVING A RELATIVELY NARROW CONTACT LNGTH WITHIN THE RANGE OF ABOUT 0.1 MM TO 100MM, SAID CONTACT AREA HAVING A ROCKWELL HARDNESS WITHIN THE RANGE OF ABOUT M 70 TO M 120 AND A COEFFICIENT OF FRICTION AGAINST CLEAN STEEL WITHIN THE RANGE OF ABOUT 0.1 TO 0.7.
Claim 2
Dependent Claim
121 words
A PROCESS FOR MAKING AN ELCTROSTATIC RECORDING MEDIUM COMPRISING THE STEPS OF FORMING A DRIED DIELECTRIC RECORDING LAYER ON A SURFACE OF AN ELECTRICALLY CONDUCTIVE SUBSTRATE SELECTED FROM THE GROUP CONSISTING OF PAPER, PLASTIC FILM AND SYNTHETIC PAPER, SAID EIELECTRIC RECORDING LAYER BEING ESSENTIALLY FORMED OF AN INSULATING RESIN MATERIAL, AND SCRAPING THE EXPOSED SURFACE OF SAID DRIED DIELECTRIC RECORDING LAYER BY DRAWING SAME TRANSVERSELY ACROSS AN ELONGATED SCRAPING MEANS WITH CONTACT AREA HAVING A RELATIVELY NARROW CONTACT LNGTH WITHIN THE RANGE OF ABOUT 0.1 MM TO 100MM, SAID CONTACT AREA HAVING A ROCKWELL HARDNESS WITHIN THE RANGE OF ABOUT M 70 TO M 120 AND A COEFFICIENT OF FRICTION AGAINST CLEAN STEEL WITHIN THE RANGE OF ABOUT 0.1 TO 0.7.
Claim 3
Dependent Claim
38 words
A process for making an electrostatic recording medium as defined in claim 1, in which said contact area of said scraper means is formed of a member selected from the group consisting of acrylic resin and ABS resin.
Claim 4
Dependent Claim
42 words
A process for making an electrostatic recording medium as defined in claim 1, in which said contact area of said scraper means is in contact wIth said exposed surface of said dielectric recording layer under a contact pressure higher than 50 g/cm2.
Claim 5
Dependent Claim
24 words
A process for making an electrostatic recording medium as defined in claim 1, in which the scraping treatment is repeated a plurality of times.
Claim 6
Dependent Claim
51 words
A process for making an electrostatic recording medium as defined in claim 1, in which said scraping means comprises as elongated member having an edge to contact said exposed surface of said dielectric recording layer, said edge being arranged in a direction transverse to the length of said dielectric recording layer.
Claim 7
Dependent Claim
82 words
A process for making an electrostatic recording medium as defined in claim 1, in which said scraping means comprises an elongated member having a contact area and a cooperating member urging said exposed surface of said dielectric recording layer to said contact surface of said elongated member, and, said electrostatic recording medium is drawn between said elongated member and said cooperating member with said exposed surface of said dielectric recording layer being in contact with said contact area of said elongated member.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |