US3859920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a hectographic master
Assignee: Individual
•
Filing: 1973-03-30
•
Granted: 1975-01-14
•
Expires: 1993-03-30
Abstract
Abstract A master for hectographic printing is made by advancing a paper sheet or tape having an obverse and reverse side in incremental steps past an operating station. At the same time, a carrier web having a thermo-melting color layer is similarly moved past the operating station at which latter is brought into contact with the reverse side of the paper, whose obverse side is sensitized so as to change color when subjected to heat. The obverse side is thereupon contacted at the station with heated instrumentalities which produce local color changes in form of indicia, and the heat passing through the paper causes corresponding local portions of the color layer to melt and adhere to the reverse side of the paper which faces the carrier web, thus producing on this side of the paper mirror-reversed replicas of the indicia, which replicas can subsequently be used for hectographic printing.
Inventors
- 👤 Gerhard Ritzerfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:10
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
A method of making a master for a hectographic copying process, comprising the steps of simultaneously advancing a nontransparent paper web having an obverse and a reverse side and provided with a thermally sensitive layer on its obverse side, together with a carrier web having a thermally transferably color layer, in incremental steps past an operating station; contacting said color layer with said reverse side of said paper web at said operating station; and applying heat to selected portions of said obverse side of said paper web at said operating station so as to produce true-image indicia on said obverse side by localized discoloration of said thermally sensitive layer and to simultaneously transfer to said reverse side portions of said color layer corresponding in shape to said indicia, said portions of said color layer adhering to said reverse side and forming thereon mirror-image replicas of said indicia which are subsequently transferable to copy sheets in a hectographic copying process as true images of said indicia.
Claim 2
Independent Claim
165 words
A method of making a master for a hectographic copying process, comprising the steps of simultaneously advancing a nontransparent paper web having an obverse and a reverse side and provided with a thermally sensitive layer on its obverse side, together with a carrier web having a thermally transferably color layer, in incremental steps past an operating station; contacting said color layer with said reverse side of said paper web at said operating station; and applying heat to selected portions of said obverse side of said paper web at said operating station so as to produce true-image indicia on said obverse side by localized discoloration of said thermally sensitive layer and to simultaneously transfer to said reverse side portions of said color layer corresponding in shape to said indicia, said portions of said color layer adhering to said reverse side and forming thereon mirror-image replicas of said indicia which are subsequently transferable to copy sheets in a hectographic copying process as true images of said indicia.
Claim 3
Dependent Claim
26 words
A method as defined in claim 1, wherein the step of applying heat comprises contacting said paper web at said obverse side with heated indicia-forming instrumentalities.
Claim 4
Dependent Claim
36 words
A method as defined in claim 1; and further comprising the final step of separating said paper web with said indicia and replicas formed thereon, from said carrier web and advancing it to a collecting station.
Claim 5
Dependent Claim
48 words
A method as defined in claim 1, wherein the step of applying heat comprises contacting said obverse side of said paper web with heated indicia-forming instrumentalities, and contacting a side of said carrier web which faces away from said paper web with a roller located opposite said instrumentalities.
Claim 6
Dependent Claim
42 words
A method as defined in claim 4, wherein said carrier web is a tape; and wherein the step of advancing said carrier web comprises withdrawing the same from a supply roll past said roller, and forwarding the carrier to a take-up roll.
References Cited (Backward Citations)
US2389854A
Cited
US2501495A
Cited
US2844094A
Cited
US3018723A
Cited
US3596055A
Cited
US3669019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |