Patent US3620735A successfully refreshed from Google Patents.
US3620735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relief image process utilizing a simple and a complex ferric salt
Assignee: Diagravure Film Manufacturing Corp
•
Filing: 1967-06-12
•
Granted: 1971-11-16
•
Expires: 1987-06-12
Abstract
Abstract A photosensitive composition for making relief images and a process for utilizing said composition is provided. The composition comprises an insolublizable water-soluble binder, a water-soluble photosensitive simple ferric salt, for example, ferric chloride or ferric oxalate, and an inhibitor for the ferric salt, for example, ammonium, sodium, potassium or lithium oxalates, ammonium ferric oxalate or tartrate.
Inventors
- 👤 Bernard Ulano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:29
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/11
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
The method of producing a stable light-sensitive supported layer from the composition of claim 1, comprising forming a layer of said composition on a support, exposing said layer to a pattern of actinic radiation, developing said exposed layer in one of an acidic oxidizing developer and in an alkaline developer to selectively insolublize respectively one of the exposed and unexposed portions of said layer, and removing the soluble portions of said layer with water to leave a durable flexible relief image.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |