US4549192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic marking systems
Assignee: HD ACQUISITION CORP A CORP OF DE
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Filing: 1984-07-31
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Granted: 1985-10-22
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Expires: 2004-07-31
Abstract
Abstract 4-(N-Acylamino)-8-(N--R 1 --N--R 2 -amino)imidazophenoxazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 1,3-diamino-7-(N--R 1 --N--R 2 -amino)phenoxazinium halide with a reducing agent to obtain the corresponding leuco compound and subsequently interacting the leuco compound with at least two molecular proportions of an acylating agent.
Inventors
- 👤 William M. Hung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:41
CPC Classifications
C; C07; C07D; C07D498/00; C07D498/02; C07D498/06; B; B41; B41M; B41M5/00; B41M5/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
A substrate for use in electrochromic recording comprising a support sheet containing as a color-forming substance a 1-R--4--(N--R--CO)amino-8-[N-(R 1 )(R 2 )amino]-9-R 3 -imidoxophenoxazine having the formula ##STR7## wherein: R represents non-tertiary C 1 to C 4 alkyl, C 4 to C 8 cycloalkyl, non-tertiary C 1 to C 4 alkyl substituted with halogen, non-tertiary C 1 to C 4 alkoxy or non-tertiary C 1 to C 4 alkoxycarbonyl, phenyl or phenyl substituted by one to three of non-tertiary C 1 to C 4 alkyl, non-tertiary C 1 to C 4 alkoxy, nitro, halo, phenyl, cyano, or trihalomethyl; R 1 and R 2 independently represent C 1 to C 4 alkyl, phenyl, phenyl substituted by one or two of halo, nitro, non-tertiary C 1 to C 4 alkyl or non-tertiary C 1 to C 4 alkoxy, benzyl or benzyl substituted in the benzene ring by one or two of halo, nitro, non-tertiary C 1 to C 4 alkyl or non-tertiary C 1 to C 4 alkoxy; and R 3 and represents hydrogen or non-tertiary C 1 to C 4 alkyl.
Claim 2
Dependent Claim
180 words
A substrate for use in electrochromic recording comprising a support sheet containing as a color-forming substance a 1-R--4--(N--R--CO)amino-8-[N-(R 1 )(R 2 )amino]-9-R 3 -imidoxophenoxazine having the formula ##STR7## wherein: R represents non-tertiary C 1 to C 4 alkyl, C 4 to C 8 cycloalkyl, non-tertiary C 1 to C 4 alkyl substituted with halogen, non-tertiary C 1 to C 4 alkoxy or non-tertiary C 1 to C 4 alkoxycarbonyl, phenyl or phenyl substituted by one to three of non-tertiary C 1 to C 4 alkyl, non-tertiary C 1 to C 4 alkoxy, nitro, halo, phenyl, cyano, or trihalomethyl; R 1 and R 2 independently represent C 1 to C 4 alkyl, phenyl, phenyl substituted by one or two of halo, nitro, non-tertiary C 1 to C 4 alkyl or non-tertiary C 1 to C 4 alkoxy, benzyl or benzyl substituted in the benzene ring by one or two of halo, nitro, non-tertiary C 1 to C 4 alkyl or non-tertiary C 1 to C 4 alkoxy; and R 3 and represents hydrogen or non-tertiary C 1 to C 4 alkyl.
Claim 3
Dependent Claim
24 words
A substrate for use in electrochromic recording according to claim 1 comprising a support sheet containing as a color-forming substance a 1-R-4-(N--R--CO)amino-8-dialkylamino-9-R 3 -imidazophenoxazine.
Claim 4
Dependent Claim
21 words
A substrate for use in electrochromic recording according to claim 2 comprising a support sheet containing as a color-forming substance 1,9-dimethyl-4-acetamido-8-diethylaminoimidazophenoxazine.
Claim 5
Dependent Claim
21 words
A substrate for use in electrochromic recording according to claim 2 comprising a support sheet containing as a color-forming substance 1-(4-methoxyphenyl)-4-(4-methoxybenzamido)-8-diethylamino-9-methylimidazophenoxazine.
Claim 6
Dependent Claim
21 words
A substrate for use in electrochromic recording according to claim 2 comprising a support sheet containing as a color-forming substance 1-phenyl-4-benzamido-8-dimethylamino-9-methylimidazophenoxazine.
Claim 7
Dependent Claim
21 words
A substrate for use in electrochromic recording according to claim 2 comprising a support sheet containing as a color-forming substance 1-propyl-4-butyramido-8-diethylamino-9-methylimidazophenoxazine.
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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |