GB386338A - Improvements in and relating to type-writing and multiple-copying processes - Google Patents
Improvements in and relating to type-writing and multiple-copying processesInfo
- Publication number
- GB386338A GB386338A GB2021131A GB2021131A GB386338A GB 386338 A GB386338 A GB 386338A GB 2021131 A GB2021131 A GB 2021131A GB 2021131 A GB2021131 A GB 2021131A GB 386338 A GB386338 A GB 386338A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- paper
- tungstic
- gallo
- silico
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
- B41M5/04—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet using solvent-soluble dyestuffs on the master sheets, e.g. alcohol-soluble
Landscapes
- Credit Cards Or The Like (AREA)
- Color Printing (AREA)
- Duplication Or Marking (AREA)
Abstract
386,338. Copying documents. IMPERIAL CHEMICAL INDUSTRIES, Ltd., Millbank, London, and JACKSON, H., Hexagon House, Blackley, Manchester. July 14, 1931, No. 20211. [Class 100 (ii).] Typewritten or copied matter prepared with an ink containing basic dyestuffs, e.g. methyl violet, magenta, or malachite green, is prevented from fading by impregnating the paper with a solution of an inorganic hetero-poly-acid, with or without an organic hetero-poly-acid, in water, methylated spirit, or other solvent of the colouring-material miscible with water. The paper is moistened with a solution of phosphomolybdic, phospho-tungstic, phospho-tungstomolybdic, silico-tungstic, or silico-molybdotungstic, or other complex acid containing phosphorus, tungsten, molybdenum, or silicon, alone or in conjunction with a gallic or tannic acid such as gallo-molybdic or gallo-tungstic acid, and is then brought into contact with a reverse copy of the matter to be copied obtained by typewriting on a sheet of paper, the back of which is in contact with a duplicating papar coated with a composition containing a basic dyestuff. Specifications 216,486 and 292,253, [both in Class 2 (iii), Dyes &c.], are referred to.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR741963D FR741963A (en) | 1931-07-14 | ||
| GB2021131A GB386338A (en) | 1931-07-14 | 1931-07-14 | Improvements in and relating to type-writing and multiple-copying processes |
| DEI42556D DE575269C (en) | 1931-07-14 | 1931-09-11 | Process for the production of lightfast typewriter documents and copies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2021131A GB386338A (en) | 1931-07-14 | 1931-07-14 | Improvements in and relating to type-writing and multiple-copying processes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB386338A true GB386338A (en) | 1933-01-16 |
Family
ID=10142254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2021131A Expired GB386338A (en) | 1931-07-14 | 1931-07-14 | Improvements in and relating to type-writing and multiple-copying processes |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE575269C (en) |
| FR (1) | FR741963A (en) |
| GB (1) | GB386338A (en) |
-
0
- FR FR741963D patent/FR741963A/fr not_active Expired
-
1931
- 1931-07-14 GB GB2021131A patent/GB386338A/en not_active Expired
- 1931-09-11 DE DEI42556D patent/DE575269C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE575269C (en) | 1933-04-26 |
| FR741963A (en) | 1933-02-23 |
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