Patent US4389451A successfully refreshed from Google Patents.
US4389451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic record material
Assignee: Kanzaki Paper Manufacturing Co Ltd
•
Filing: 1982-02-03
•
Granted: 1983-06-21
•
Expires: 2002-02-03
Abstract
Abstract An electrostatic record material comprising an electroconductive base sheet and a record layer formed on the base sheet and composed mainly of insulating resin, the record material being characterized in that the electroconductive base sheet has an electroconductive layer comprising (1) electron conductive particles produced by coating the particles of an inorganic compound with an electroconductive substance consisting of stannic oxide and a small amount of antimony and (2) a water-soluble adhesive composed of salts of a copolymer of at least 20 mole % of acrylic acid or methacrylic acid monomer.
Inventors
- 👤 Hironari Fujioka
- 👤 Hajime Matsubayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:39
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/104; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24917; Y10T428/24934; Y10T428/24942; Y10T428/25; Y10T428/252; Y10T428/256; Y10T428/257; Y10T428/258; Y10T428/259; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/2998; Y10T428/31504; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
An electrostatic record material comprising an electroconductive base sheet and a record layer formed on the base sheet and composed mainly of insulating resin, the record material being characterized in that the electroconductive base sheet has an electroconductive layer comprising (1) electron conductive particles produced by coating the particles of an inorganic compound with an electroconductive substance consisting of stannic oxide and 0.1 to 20 percent by weight of antimony, the electron conductive particles having a specific resistivity of 10 -2 to 10 3 ohm. cm. at a pressure of 150 kg/cm 2 and (2) a water-soluble adhesive composed of salts of a copolymer of at least 20 mole % of acrylic acid or methacrylic acid monomer, the amount of the water-soluble adhesive being 3 to 100 parts by weight per 100 parts by weight of the electron conductive particles.
Claim 2
Dependent Claim
140 words
An electrostatic record material comprising an electroconductive base sheet and a record layer formed on the base sheet and composed mainly of insulating resin, the record material being characterized in that the electroconductive base sheet has an electroconductive layer comprising (1) electron conductive particles produced by coating the particles of an inorganic compound with an electroconductive substance consisting of stannic oxide and 0.1 to 20 percent by weight of antimony, the electron conductive particles having a specific resistivity of 10 -2 to 10 3 ohm. cm. at a pressure of 150 kg/cm 2 and (2) a water-soluble adhesive composed of salts of a copolymer of at least 20 mole % of acrylic acid or methacrylic acid monomer, the amount of the water-soluble adhesive being 3 to 100 parts by weight per 100 parts by weight of the electron conductive particles.
Claim 3
Dependent Claim
20 words
An electrostatic record material according to claim 1 in which the specific resistivity is 10 -1 to 5×10 2 ohm·cm.
Claim 4
Dependent Claim
25 words
An electrostatic record material according to claim 1 in which the copolymer contains 30 to 80 mole % of acrylic acid or methacrylic acid monomer.
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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |