Patent US3681070A successfully refreshed from Google Patents.
US3681070A
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Electroconductive layers of water insoluble copolymers of styrene and sulfonic acid or salts for use in recording materials
Assignee: Agfa Gevaert NV
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Filing: 1969-06-20
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Granted: 1972-08-01
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Expires: 1989-06-20
Abstract
Abstract AN ELECTROCONDUCTIVE LAYER FOR SHEET MATERIAL HAVING A SURFACE RESISTIVITY LOWER THAN 10**11 OHMS/SQ. CM. AND FORMED OF A COPOLYMER OF STYRENE AND STYRENE SULPHONIC ACID OR ACID SALT HAVING A STYRENE SULPHONIC ACID CONTENT WITHIN THE RANGE OF ABOUT 17.5-35 MOLE PERCENT.
Inventors
- 👤 Daniel Maurice Timmerman
- 👤 Karel Eugeen Verhille
- 👤 August Jean Van Paesschen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:49
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/087; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89; G03G5/05; G03G5/0528; G03G5/0596; G03G5/10; G03G5/101; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/17
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |