US4374001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic printing
Assignee: International Business Machines Corp
•
Filing: 1981-02-05
•
Granted: 1983-02-15
•
Expires: 2001-02-05
Abstract
Abstract An electrochromic printable media which includes a substrate coated with certain leuco dyes and with a bromide compound; and use thereof for electrochromic printing.
Inventors
- 👤 William E. Bernier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:47
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/20
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
145 words
An electrochromic printing media which comprises a substrate coated on at least one surface thereof with about 2 to about 100 milligrams for each 81/2" by 11" area of said substrate of a leuco dye color forming material of the formula: ##STR4## wherein A is C═O or SO 2 ; B is S or O; each R 1 and R 2 individually is a group capable of donating an electron; and R is an organic radical such that in the presence of bromine and upon being subjected to a voltage, the leuco dye converts to a colored dye upon splitting of the A--R group; and coated with at least about 10 milligrams for each 81/2" by 11" area of said substrate of said leuco dye; and wherein the weight ratio of bromide to leuco dye is about 1 to 1 to about 30 to 1.
Claim 2
Dependent Claim
145 words
An electrochromic printing media which comprises a substrate coated on at least one surface thereof with about 2 to about 100 milligrams for each 81/2" by 11" area of said substrate of a leuco dye color forming material of the formula: ##STR4## wherein A is C═O or SO 2 ; B is S or O; each R 1 and R 2 individually is a group capable of donating an electron; and R is an organic radical such that in the presence of bromine and upon being subjected to a voltage, the leuco dye converts to a colored dye upon splitting of the A--R group; and coated with at least about 10 milligrams for each 81/2" by 11" area of said substrate of said leuco dye; and wherein the weight ratio of bromide to leuco dye is about 1 to 1 to about 30 to 1.
Claim 3
Dependent Claim
57 words
The electrochromic printing media of claim 1 wherein each R 1 and R 2 individually is selected from the group of OR 3 , NR 4 R 5 , and R 6 wherein each R 3 , R 4 and R 5 is individually hydrogen or an alkyl group and each R 6 is an alkyl group.
Claim 4
Dependent Claim
17 words
The electrochromic printable media of claim 2 wherein said alkyl group contains 1 to 8 carbon atoms.
Claim 5
Dependent Claim
41 words
The electrochromic printing media of claim 1 wherein each R 1 and R 2 individually is selected from the group of OH, N(CH 3 ) 2 , N(C 2 H 5 ) 2 , NCH 3 H, and CH 3 .
Claim 6
Dependent Claim
28 words
The electrochromic printing media of claim 1 wherein each R 1 and R 2 individually is selected from the group of OH and N(CH 3 ) 2 .
Claim 7
Dependent Claim
22 words
The electrochromic printing media of claim 1 wherein R is selected from the group of alkyl, aryl, substituted aryl, cycloaliphatic, and heterocyclic.
Claim 8
Dependent Claim
15 words
The electrochromic printing media of claim 6 wherein R contains 1 to 22 carbon atoms.
Claim 9
Dependent Claim
15 words
The electrochromic printing media of claim 6 wherein R contains 1 to 12 carbon atoms.
Claim 10
Dependent Claim
11 words
The electrochromic printing media of claim 1 wherein R is phenyl.
Claim 11
Dependent Claim
13 words
The electrochromic printing media of claim 1 wherein R is CH 3 .
Claim 12
Dependent Claim
11 words
The electrochromic printing media of claim 1 wherein A is CO.
Claim 13
Dependent Claim
11 words
The electrochromic printing media of claim 1 wherein B is S.
Claim 14
Dependent Claim
16 words
The electrochromic printing media of claim 1 wherein said leuco dye is benzoyl leuco methylene blue.
Claim 15
Dependent Claim
22 words
The electrochromic printing media of claim 1 wherein the weight ratio of bromide to leuco dye is about 5:1 to about 10:1.
Claim 16
Dependent Claim
19 words
The electrochromic printing media of claim 1 wherein the maximum amount of said leuco dye is about 10 milligrams.
Claim 17
Dependent Claim
31 words
The electrochromic printing media of claim 1 wherein the bromide is employed in an amount of about 10 milligrams to about 1 gram for each 81/2" by 11" area of substrate.
Claim 18
Dependent Claim
25 words
The electrochromic printing media of claim 1 wherein the bromide is selected from the group of ammonia bromide, potassium bromide, sodium bromide, and mixtures thereof.
Claim 19
Dependent Claim
13 words
The electrochromic printing media of claim 1 wherein said substrate is ordinary paper.
Claim 20
Dependent Claim
23 words
A method of electrochromic printing which comprises applying an electrical field in a predetermined pattern across the electrochromic printable media of claim 1.
Claim 21
Dependent Claim
16 words
The method of claim 19 wherein the voltage applied is about 0.5 to about 15 volts.
Claim 22
Dependent Claim
15 words
The method of claim 19 wherein the voltage applied is at least about 5 volts.
Claim 23
Dependent Claim
37 words
Method for preparing the electrochromic printing media of claim 1 which comprises first coating said substrate with an aqueous solution of a bromide followed by coating the substrate with an organic solvent solution of said leuco dye.
Claim 24
Dependent Claim
13 words
The media of claim 1 which is at least substantially free from iodides.
Claim 25
Dependent Claim
22 words
The media of claim 1 which is at least substantially free from color-forming agents other than said leuco dye color forming material.
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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |