Patent US3833409A successfully refreshed from Google Patents.
US3833409A
Expired / Lapsed
US
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Donor sheet for pulsed electrical printing
Assignee: Carters Ink Co
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Filing: 1972-01-07
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Granted: 1974-09-03
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Expires: 1992-01-07
Abstract
Abstract A printing ribbon for non-impact electrical printing consists of an insulating base film, having a microcavernous surface formed by microscopic crags having deep rough and irregular pits or valleys between them with fine conductive printing particles loosely retained on and in the surface.
Inventors
- 👤 J Peshin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:04
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24008; Y10T428/24017
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
A donor sheet as defined by claim 1 wherein the microcavernous surface of the base sheet presents a total surface at least two times its projected area which is based on squaring the linear measurements of the actual surface outline and of its projection.
Claim 2
Dependent Claim
42 words
A donor sheet as defined by claim 1 wherein the base sheet surface comprises particles of filler 5-175 microns across, embedded in a synthetic organic insulating resin, said resin being between 5 and 40% by weight of the total resin plus filler.
Claim 3
Independent Claim
117 words
The method of making a donor sheet suitable for pulsed electrical printing comprising the steps of: mixing coarse particles of filler 5-175 microns across in a solution of an organic insulating resin having a solvent content over 50% by volume and a resin content of 5-40% by weight based on resin plus filler, coating said mixture onto a base sheet, drying said coating, thereby forming a microcavernous surface coating on said sheet with pits or valleys of about 10-50 microns across and 10-50 microns deep, and applying loose print particles to the dried coating, said particles having a conductivity at least that of a semiconductor, and said particles being of size between about 0.25 and 15 microns.
Claim 4
Dependent Claim
15 words
The method defined by claim 4 wherein the print particles are brushed on the coating.
References Cited (Backward Citations)
US3617328A
Cited
US3550153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |