US4365012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light sensitive recording material
Assignee: Agfa Gevaert AG
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Filing: 1981-01-02
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Granted: 1982-12-21
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Expires: 2001-01-02
Abstract
Abstract The light sensitive recording material which is suitable for use as recording material in computers and oscillographs contains as light sensitive substance a photochromic film forming cyclic polyimide compound.
Inventors
- 👤 Jurgen Hocker
- 👤 Erwin Ranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:36
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1075; C08G73/1082; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/733; Y; Y10; Y10S; Y10S430/00; Y10S430/163
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
A process for producing reversible images in a light-sensitive recording material which comprises the step of imagewise exposing to light, a supported layer containing a light-sensitive substance corresponding to the formula ##STR19## in which R represents a divalent aliphatic group containing an electron donor function; R 1 represents hydrogen, halogen, SO 3 H, CN, COOR 2 , N(R 3 ) 2 , OR 4 , or NO 2 ; R 2 , R 3 , and R 4 represent hydrogen or C 1 -C 6 alkyl and n represents an integer of from 2 to 1,000 and subsequently reverting said recording material to a monochromatic state.
Claim 2
Dependent Claim
106 words
A process for producing reversible images in a light-sensitive recording material which comprises the step of imagewise exposing to light, a supported layer containing a light-sensitive substance corresponding to the formula ##STR19## in which R represents a divalent aliphatic group containing an electron donor function; R 1 represents hydrogen, halogen, SO 3 H, CN, COOR 2 , N(R 3 ) 2 , OR 4 , or NO 2 ; R 2 , R 3 , and R 4 represent hydrogen or C 1 -C 6 alkyl and n represents an integer of from 2 to 1,000 and subsequently reverting said recording material to a monochromatic state.
Claim 3
Dependent Claim
40 words
A process for producing reversible images according to claim 1, wherein R 1 represents hydrogen and R is derived from an alkylene triamine corresponding to the formula ##STR20## in which R 5 =H, alkyl or CR 2 O and n=1-4.
Claim 4
Dependent Claim
37 words
A process for producing reversible images according to claim 1, wherein R 1 represents hydrogen and R is derived from an oxaalkylene diamine corresponding to the formula NH.sub.2 --CH.sub.2).sub.m --O--(CH.sub.2).sub.m --O](CH.sub.2).sub.m NH.sub.2 in which m=1-4, and o=0-2.
References Cited (Backward Citations)
US3533798A
Cited
US3629180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |