US3632364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed sheets containing concealed images and method & materials for preparation and visual development of same
Assignee: AB Dick Co
•
Filing: 1968-09-03
•
Granted: 1972-01-04
•
Expires: 1988-09-03
Abstract
Abstract A system for the preparing of copy containing concealed images and a marking material for the development of same in which the components comprise a receiving material in the form of starch or polyvinyl alcohol, an iodide which is oxidizable to iodine, and an oxidizing agent for oxidizing the iodide in which the oxidizing agent is contained in the imaging material to produce the concealed image, the iodine is contained in the marking material for the development of the image and the starch or polyvinyl alcohol are contained in the copy sheet, the printing material or the marking material whereby, when the marking material is applied to the concealed image, the oxidizing agent oxidizes the iodide to release iodine for producing an intense color with the starch or polyvinyl alcohol and in which the printing process is adapted to conventional printing systems.
Inventors
- 👤 Richard E Thomas
- 👤 Robert T Florence
- 👤 Rustom H Dalal
- 👤 Raymond I Scheuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:30
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/025; B41M5/0253; B41M3/00; B41M3/001; B41M5/04; Y; Y10; Y10S; Y10S101/00; Y10S101/29
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
30 words
The method as claimed in claim 1 in which the copper salt is selected from the group consisting of the chloride, nitrate, sulphate, acetate, lactate, benzoate, or stearate of copper.
Claim 2
Dependent Claim
36 words
The method as claimed in claim 1 in which the positive halogen compound is selected from the group consisting of trichloromelamine, N-chlorosuccinimide, N-bromosuccinimide, N-chlorophthalimide, monobromantin, diodantin, dibromethyl ethyl hydantoin, dichloromethyl ethyl hydantoin, N-bromoglutarimide, N-chloroglutarimide and N-haloaminitriazines.
Claim 3
Dependent Claim
34 words
The method as claimed in claim 1 which includes with the copper salt or positive halogen compound and an amine selected from the group consisting of piperidine, piperazine, phenylenediamine, tallowamine, trichloromelamine, triisopropanolamine and melamine.
Claim 4
Dependent Claim
25 words
The method as claimed in claim 1 in which the iodide is selected from the group consisting of an alkali metal iodide and ammonium iodide.
Claim 5
Dependent Claim
89 words
The method as claimed in claim 1 in which the image is printed on the copy sheet by a spirit duplicating process which makes use of a spirit master, a coated transfer sheet, copy sheets and a spirit fluid with which the copy sheets are wet before contact with the spirit master for leaching materials from the image for transfer from the master sheet to the copy sheet, the copper salt or positive halogen compound is a spirit soluble material contained in the transfer coating of the transfer sheet.
Claim 6
Dependent Claim
41 words
The method as claimed in claim 6 in which the spirit master is also imaged with a conventional image containing a spirit soluble dye to provide a master for producing a concealed image and a visible image on the copy sheets.
Claim 7
Dependent Claim
50 words
The method as claimed in claim 1 in which, when the printing process is a stencil duplicating process, the copper salt or positive halogen compound is contained in the stencil fluid forced through the stencil openings of a stencil sheet onto copy sheets to produce copy containing the concealed image.
Claim 8
Dependent Claim
55 words
The method as claimed in claim 1 in which, when the printing process is a lithographic printing process, the copper salt or positive halogen compound is embodied in an oleophilic fluid with which the imaged lithographic plate is wet for transfer of the oleophilic fluid from the imaged areas of the master to copy sheets.
Claim 9
Dependent Claim
46 words
The method as claimed in claim 1 in which, when the printing process is a letterpress process, a gravure process, a silk screen printing process, a jet printing process, or a stamp process, the copper salt or positive halogen compound is embodied in the printing ink.
Claim 10
Dependent Claim
63 words
A printed copy sheet comprising a Visible image portion and a concealed image portion containing a copper salt or positive halogen compound capable of oxidizing an iodide to iodine and in which the concealed image portion contains a material selected from the group consisting of starch and polyvinyl alcohol which is responsive to the released iodine for the development of an intense color.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |