Patent US2985349A successfully refreshed from Google Patents.
Patent US3901710A successfully refreshed from Google Patents.
US3901710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material comprising a light-sensitive 1,4-dihydropyridine derivative
Assignee: Agfa Gevaert AG
•
Filing: 1973-08-21
•
Granted: 1975-08-26
•
Expires: 1993-08-21
Abstract
Abstract This invention relates to the reproduction of originals on light-sensitive copying materials by producing positive relief images using a material that contains a 1,4-dihydropyridine derivative according to the indicated formula.
Inventors
- 👤 Erwin Ranz
- 👤 Friedrich Bossert
- 👤 Heinz Dieter Schutz
- 👤 Harald Von Rintelen
- 👤 Gerard Albert Delzenne
- 👤 Jaeger Antoine August De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:18
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/80; C07D211/82; C07D211/84; C07D211/90; C07D215/00; C07D215/02; C07D215/16; C07D215/48; C07D215/54; G; G03; G03F; G03F7/00; G03F7/004; G03F7/0045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
A LIGHT-SENSITIVE PHOTOGRAPHIC ELEMENT FOR THE PRODUCTION OF POSITIVE RELIEF IMAGES, COMPRISING A SHEET-LIKE SUPPORT CAR RYING A LIGHT-SENSITIVE LAYER CONTAINING A 184-DIHYDROPYRIDINE OF THE FOLLOWING FORMULA
Claim 2
Dependent Claim
27 words
A LIGHT-SENSITIVE PHOTOGRAPHIC ELEMENT FOR THE PRODUCTION OF POSITIVE RELIEF IMAGES, COMPRISING A SHEET-LIKE SUPPORT CAR RYING A LIGHT-SENSITIVE LAYER CONTAINING A 184-DIHYDROPYRIDINE OF THE FOLLOWING FORMULA
Claim 3
Dependent Claim
20 words
The material of claim 1, wherein R1 and R2 represent methyl and R3 and R4 stand for the group COOR5.
Claim 4
Dependent Claim
27 words
The light-sensitive photographic element as claimed in claim 1 wherein the support is coated with layer containing a dye which provides a color contrast with the support.
Claim 5
Dependent Claim
19 words
The light-sensitive photographic element as claimed in claim 3 wherein the 1,4-dihydropyridine derivative is contained in the dyed layer.
Claim 6
Dependent Claim
24 words
The light-sensitive photographic element as claimed in claim 3 wherein the 1,4-dihydropyridine derivative is contained in a separate layer superimposed on the dyed layer.
References Cited (Backward Citations)
US3519424A
Cited
US3776735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |