Patent US4093464A successfully refreshed from Google Patents.
US4093464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light sensitive o-quinone diazide containing transfer composition
Assignee: Hoechst AG
•
Filing: 1973-07-26
•
Granted: 1978-06-06
•
Expires: 1993-07-26
Abstract
Abstract A light-sensitive layer transfer material and such layer disposed on a carrier, for use in screen-printing stencils, printed circuit boards, integrated circuits, intaglio printing plates, relief printing plates, proof prints and the like, which comprises an alkali-soluble phenolic resin, such as phenol-formaldehyde novolacs, an ester or an amide of an o-naphthoquinone-diazide sulphonic acid, such as the p-cumyl phenyl ester of 1,2-naphthoquinone-2-diazide-4-sulphonic acid, etc., and an acrylic resin, such as a polymer of an alkyl ester of acrylic acid or methacrylic acid.
Inventors
- 👤 Hans Ruckert
- 👤 Barbara Wildenhain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:30
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/023; G03F7/0233
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
64 words
A light-sensitive transfer composition comprising, as separate compounds in a homogeneous mixture, (a) about 25 to 40% by weight of an alkali-soluble novolak, (b) about 12 to 30% by weight of an o-naphthoquinone diazide sulfonic acid derivative selected from the group consisting of esters thereof and amides thereof, and (c) about 5 to 30% by weight of a polyalkyl acrylate or a polyalkyl methacrylate.
Claim 2
Dependent Claim
64 words
A light-sensitive transfer composition comprising, as separate compounds in a homogeneous mixture, (a) about 25 to 40% by weight of an alkali-soluble novolak, (b) about 12 to 30% by weight of an o-naphthoquinone diazide sulfonic acid derivative selected from the group consisting of esters thereof and amides thereof, and (c) about 5 to 30% by weight of a polyalkyl acrylate or a polyalkyl methacrylate.
Claim 3
Dependent Claim
25 words
A composition as claimed in claim 1 wherein the light-sensitive material additionally contains from about 5 to about 35% by weight of a polyvinyl ether.
References Cited (Backward Citations)
US3544317A
Cited
US3502470A
Cited
US3474719A
Cited
US3551154A
Cited
US3634082A
Cited
US3721557A
Cited
US3637384A
Cited
GB1267005A
Cited
US3649283A
Cited
US3660097A
Cited
US3764318A
Cited
US3782939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |