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US3945934A Expired / Lapsed US ⏱️ 0.0 years remaining

Xerographic toner composition

Assignee: Individual
•
Filing: 1973-07-16
•
Granted: 1976-03-23
•
Expires: 1993-07-16
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Abstract

Abstract Raised Xerographic printing is produced by the use of thermally intumesced electroscopic powders for the development of the electrophotographic images. Intumescent electroscopic powders are blended with the powdered pigmented "ink" or "Toner" in the ink reservoir of a Xerographic copying machine. The image is formed and transferred to a paper carrier in the wellknown process of Carlson, U.S.P. at No. 2,297,691. The heat used in thermoadhesively attaching the "Toner" to the paper carrier also causes great intumescence of the intumescent powder, resulting in a raised image. The image is similar in appearance and texture to "engraving" or raised thermographic printing. It can be read by the sightless by tactile recognition. The intumescent powder used is made of vinylidene-chloride-acrylonitrile-isobutane as described by the inventor in his Disclosure Document No. 001,078 filed in the U.S. Patent Office on Dec. 22, 1969. Original Application was submitted in raised printing exemplifying this invention. It was produced by the normal copying operation of a Xerox 813 Copier without any mechanical changes using the intumescent "Toner" of the present invention.

Inventors

  • 👤 Ezekiel J. Jacob

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 11:37
CPC Classifications
G; G09; G09B; G09B21/00; G09B21/001; G09B21/003; G03; G03G; G03G13/00; G03G13/22; G03G9/00; G03G9/08; G03G9/09; G03G9/0926

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 53 words
A xerographic toner composition comprising a stable, dry, free-flowing, self-contained intumescent electroscopic powder mixture including a thermoadhesive agent, a pigment and a dry intumescing agent incorporated therein, said intumescing agent being comprised of plastic microspheres containing occluded gas therewithin at ambient temperatures and being expandible in size upon being subjected to elevated temperature.
Claim 2
Dependent Claim 53 words
A xerographic toner composition comprising a stable, dry, free-flowing, self-contained intumescent electroscopic powder mixture including a thermoadhesive agent, a pigment and a dry intumescing agent incorporated therein, said intumescing agent being comprised of plastic microspheres containing occluded gas therewithin at ambient temperatures and being expandible in size upon being subjected to elevated temperature.
Claim 3
Dependent Claim 15 words
A composition according to claim 1 in which said occluded gas is a hydrocarbon gas.
Claim 4
Dependent Claim 14 words
A composition according to claim 2 in which said microspheres are of synthetic plastic.
Claim 5
Dependent Claim 33 words
In the composition of claim 1, said microspheres being comprised of vinylidene chloride-acrylonitrile copolymers, having a diameter in the range of about 0.5 to 20 microns and the occluded gas being predominantly isobutane.
Claim 6
Dependent Claim 29 words
In the composition of claim 4, said microspheres being comprised of vinylidene chloride-acrylonitrile copolymers, having an average diameter of about 8 microns and the occluded gas being predominantly isobutane.
Claim 7
Dependent Claim 28 words
In the composition of claim 5, said intumescing agent being present in an amount of from about 0.1% to about 99.5% by volume based on the total composition.
Claim 8
Dependent Claim 17 words
In the composition of claim 5, said microspheres comprising about 20% by volume of the total composition.
Claim 9
Dependent Claim 34 words
A xerographic toner composition comprising a stable, dry, free-flowing, self-contained intumescent electroscopic powder mixture including a thermoadhesive agent, a pigment and a dry intumescing agent, comprised of microspheres containing releasably occluded gas, incorporated therein.
Claim 10
Dependent Claim 34 words
A xerographic toner composition comprising a stable, dry, free-flowing, self-contained intumescent electroscopic powder mixture including a thermoadhesive agent, a pigment and a dry intumescing agent, comprised of microspheres containing releasably occluded gas, incorporated therein.
Claim 11
Dependent Claim 12 words
In the composition of claim 8, said microspheres being of hollow configuration.
Claim 12
Dependent Claim 12 words
The composition of claim 9 in which said occluded gas is air.
Claim 13
Dependent Claim 12 words
The composition of claim 8 in which said occluded gas is nitrogen.
Claim 14
Dependent Claim 12 words
The composition of claim 9 in which said occluded gas is nitrogen.

References Cited (Backward Citations)

US3696060A Cited
US3432328A Cited
US3440076A Cited
US3484262A Cited
US3515569A Cited
US3586654A Cited
US3674736A Cited
US3629380A Cited
US3640861A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-03-23 1979-09-22 1980-03-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-03-23 1983-09-22 1984-03-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-03-23 1987-09-22 1988-03-23 $7700.00 Window Closed / Lapsed

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