US3615468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoprinting process and article
Assignee: GTE Sylvania Inc
•
Filing: 1968-11-06
•
Granted: 1971-10-26
•
Expires: 1988-11-06
Abstract
Abstract A photographic master is disclosed wherein the master comprises a base, a pattern, a protective coating and a plurality of protrusions that provide a gas escapement means when the master is used to provide a pattern upon a metallic sheet in a contact printing process. An improved process and a new composition for providing the protective coating and the protrusions are also disclosed.
Inventors
- 👤 Lauri D Tiala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:47
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/88
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
A photographic master according to claim 1 wherein said solid material has a particle size of from about 3 microns to about 50 microns.
Claim 2
Dependent Claim
279 words
In a process wherein a relatively thin flat metallic sheet is coated with a light sensitive material, a design is photoprinted on the light sensitive coating by the use of a master in contact with said coated metallic sheet and contact is established by the use of vacuum printing frames and portions of the coating are rendered selectively removable by said photoprinting step and a design is thereafter etched in said sheet, and wherein a master is brought into contact with said sheet wherein said master comprises: a base of a transparent sheet having at least one essentially planar surface that describes a first plane; a photographic emulsion in the form of a pattern, said emulsion having an inner surface adhered to a portion of said planar surface of said base and having an external surface that describes a second plane that is substantially parallel and external to said first plane; and a solid protective coating over said emulsion, the improvement comprising reducing the time to achieve suitable contact between said master and said sheet by providing a plurality of protrusions extending externally to a portion of said planar surface of said base, said protrusions having external surfaces that describe a third plane that is external and substantially parallel to said first and second planes, said protrusions consisting of relatively finely divided, solid inorganic material having a hardness greater than said metallic sheet, whereby when said third plane is in essentially flat contact with said essentially planar surface of said flat metallic sheet, a gas escapement means is formed between said master and said flat metallic sheet for removal of air trapped between said master and said metal sheet.
Claim 3
Dependent Claim
23 words
An improvement according to claim 3 wherein the particle size of said solid material is from about 3 microns to about 50 microns.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |