Patent US8463038B2 successfully refreshed from Google Patents.
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Multilayer dry-film positive-acting o-quinone diazide photoresist with integral laminable layer, photoresist layer, and strippable carrier layer
Assignee: 3M Co
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Filing: 1982-09-29
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Granted: 1987-06-09
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Expires: 2002-09-29
Abstract
Abstract Dry-film, positive-acting photoresist layers are used in the formation of many articles such as circuit boards, printing plates and the like. Laminable monolayers of photoresist suffer from slow speeds, brittleness, and narrow latitude during development and exposure. The use of a thermoplastic, crosslinked or crosslinkable integral adhesive layer on the dry-film, positive-acting photoresist layer improves the properties and performance of the photoresist.
Inventors
- 👤 Peter M. Koelsch
- 👤 John P. Vikesland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:52
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/092; H; H05; H05K; H05K3/00; H05K3/0073; H05K3/10; H05K3/18; H05K3/181; H05K3/182; H05K3/184
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A dry-film, positive-acting, laminable photoresist comprising: (a) a first layer of positive-acting photoresist layer comprising an o-quinone diazide in an organic polymeric phenol formaldehyde resin binder, said first layer becoming more soluble in an aqueous alkaline solution after exposure to actinic radiation, and (b) an integral second layer, adjacent and adhered to a surface of said first layer, of a laminable to a receptor layer crosslinked or crosslinkable organic polymer which is soluble in an aqueous alkaline solution or organic solvent, wherein said second layer comprises (1) an acrylic copolymer or terpolymer and (2) a phenol formaldehyde resin crosslinked with a polyisocyanate and wherein a strippable carrier layer is adhered to said first layer.
Claim 2
Dependent Claim
114 words
A dry-film, positive-acting, laminable photoresist comprising: (a) a first layer of positive-acting photoresist layer comprising an o-quinone diazide in an organic polymeric phenol formaldehyde resin binder, said first layer becoming more soluble in an aqueous alkaline solution after exposure to actinic radiation, and (b) an integral second layer, adjacent and adhered to a surface of said first layer, of a laminable to a receptor layer crosslinked or crosslinkable organic polymer which is soluble in an aqueous alkaline solution or organic solvent, wherein said second layer comprises (1) an acrylic copolymer or terpolymer and (2) a phenol formaldehyde resin crosslinked with a polyisocyanate and wherein a strippable carrier layer is adhered to said first layer.
References Cited (Backward Citations)
US3721557A
Cited
US3469982A
Cited
US4193797A
Cited
US4193797B1
Cited
US3782939A
Cited
US4217407A
Cited
GB1493833A
Cited
GB1493834A
Cited
US4189320A
Cited
US4180604A
Cited
US4204009A
Cited
US4169732A
Cited
US4311784A
Cited
US4349620A
Cited
US4247616A
Cited
US4260673A
Cited
US4352870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |