Patent US3615408A successfully refreshed from Google Patents.
US3615408A
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US
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Polymeric quaternary derivatives of 4-vinyl pyridine in electrically conductive paper
Assignee: DeSoto Inc
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Filing: 1968-12-13
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Granted: 1971-10-26
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Expires: 1988-12-13
Abstract
Abstract Quaternary polymers of 4-vinyl pyridine are used to render paper electrically conductive and therefore useful to receive photoconductive coatings to produce electrostatic copy paper.
Inventors
- 👤 Charles M Taubman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:04
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/105; G03G5/107; C; C08; C08F; C08F20/00; C08F20/02; C08F20/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
19 words
Electrically conductive paper as recited in claim 1 in which said quaternary polymer is applied in an aqueous solution.
Claim 2
Dependent Claim
31 words
Electrically conductive paper as recited in claim 1 in which said quaternary polymer is obtained by reacting said 4-vinyl pyridine or substitution product thereof with an alkylating agent in aqueous medium.
Claim 3
Dependent Claim
36 words
Electrically conductive paper as recited in claim 3 in which 4-vinyl pyridine is reacted with at least a molar proportion of methyl chloride in an aqueous medium containing 2-30 percent by weight of water-miscible organic solvent.
Claim 4
Dependent Claim
23 words
Electrically conductive paper as recited in claim 4 in which the reaction is conducted at a temperature in the range of 40*-100* C.
Claim 5
Dependent Claim
30 words
Electrically conductive paper as recited in claim 1 in which said paper is impregnated with an aqueous medium containing said quaternary polymer is solution and thickened with a thickening agent.
Claim 6
Dependent Claim
22 words
Electrostatic copy paper comprising an electrically conductive paper as recited in claim 1 having a surface thereof coated with a photoconductive coating.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |