US3867153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photohardenable element
Assignee: EIDP Inc
•
Filing: 1972-09-11
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Granted: 1975-02-18
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Expires: 1992-09-11
Abstract
Abstract An improved photohardenable element is provided which comprises (1) a support, (2) photohardenable layer and (3) a protective cover sheet laminated to the surface of said photohardenable layer. The improvement consists of hardening a small continuous region along the edges of the photohardenable layer, i.e., by selectively exposing the region to actinic radiation. The major portion of said photohardenable layer is between said narrow continuous regions and is substantially unhardened and enexposed to actinic radiation, said narrow continuous regions being at least 0.00005 inches wide and of sufficient width to prevent excessive laminar flow of the photohardenable layer caused by pressure and temperature when the element is in stacked sheet or roll form.
Inventors
- 👤 Alexander Maclachlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:38
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03C; G03C3/00; G03F7/16; G03F7/168; G03F7/20; G03F7/2022; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24752; Y10T428/24777; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
IN A PHOTOHARDENABLE ELEMENT, COMPRISING A SUPPORT, A HIGHLY PLASTICIZED PHOTOHARDENABLE LAYER AND A PROTECTIVE COVER SHEET, THE IMPROVEMENT WHEREIN SAID PHOTOHARDENABLE LAYER HAS BEEN HARDENED TO PROVIDE NARROW CONTINUOUS REGIONS OF HARDENED MATERIAL ALONG ITS EDGES AND WHEREIN THE MAJOR PORTION OF SAID PHOTOHARDENABLE LAYER IS BETWEEN SAID NARROW CONTINUOUS REGIONS AND IS SUBSTNTIALLY UNHARDENED AND UNEXPOSED TO ACTINIC RADIATION, SAID NARROW CONTINUOUS REGIONS BEING AT LEAST 0.00005 INCHES WIDE AND OF SUFFICIENT WIDTH TO PREVENT EXCESSIVE LAMINAR FLOW OF THE PHOTOHARDENABLE LAYER CAUSED BY PRESSURE AND TEMPERATURE WHEN THE ELEMENT IS STACKED SHEET OR ROLL FORM.
Claim 2
Dependent Claim
98 words
IN A PHOTOHARDENABLE ELEMENT, COMPRISING A SUPPORT, A HIGHLY PLASTICIZED PHOTOHARDENABLE LAYER AND A PROTECTIVE COVER SHEET, THE IMPROVEMENT WHEREIN SAID PHOTOHARDENABLE LAYER HAS BEEN HARDENED TO PROVIDE NARROW CONTINUOUS REGIONS OF HARDENED MATERIAL ALONG ITS EDGES AND WHEREIN THE MAJOR PORTION OF SAID PHOTOHARDENABLE LAYER IS BETWEEN SAID NARROW CONTINUOUS REGIONS AND IS SUBSTNTIALLY UNHARDENED AND UNEXPOSED TO ACTINIC RADIATION, SAID NARROW CONTINUOUS REGIONS BEING AT LEAST 0.00005 INCHES WIDE AND OF SUFFICIENT WIDTH TO PREVENT EXCESSIVE LAMINAR FLOW OF THE PHOTOHARDENABLE LAYER CAUSED BY PRESSURE AND TEMPERATURE WHEN THE ELEMENT IS STACKED SHEET OR ROLL FORM.
Claim 3
Dependent Claim
14 words
The photohardenable element of claim 1 wherein said photohardenable layer is a photopolymerizable layer.
Claim 4
Dependent Claim
14 words
The photohardenable element of claim 1 wherein said photohardenable layer is a photocrosslinkable layer.
Claim 5
Dependent Claim
22 words
The photohardenable element of claim 1 wherein said narrow continuous region of hardened material is about 0.00005 to about 0.05 inch wide.
Claim 6
Dependent Claim
16 words
The photohardenable element of claim 1 wherein said narrow continuous region of hardened material is photohardened.
Claim 7
Dependent Claim
23 words
The photohardenable element of claim 1 wherein said narrow continuous region of hardened material is between said support and said protective cover sheet.
Claim 8
Dependent Claim
26 words
The photohardenable element of claim 1 wherein said narrow continuous region of hardened material is disposed along at least two parallel edges of said photohardenable element.
Claim 9
Dependent Claim
13 words
The photohardenable element of claim 1 wherein said hardened material contains a colorant.
References Cited (Backward Citations)
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US1845133A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |