US4991359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of abrading a hardened resin
Assignee: Somar Corp
•
Filing: 1989-10-30
•
Granted: 1991-02-12
•
Expires: 2009-10-30
Abstract
Abstract A method of treating a metal-plated board for the removal of a hardened, alkali-soluble resin layer therefrom, comprising the steps of: (a) contacting a surface of the resin layer with an aqueous alkaline liquid such as an aqueous sodium carbonate solution to swell the surface; (b) abrading the resin layer having the swollen surface, step (b) being preceded by or simultaneous with step (a); and (c) then washing the abraded surface with an aqueous neutral liquid such as water.
Inventors
- 👤 Osamu Ogitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:28
CPC Classifications
B; B24; B24B; B24B29/00; B24B1/00; H; H05; H05K; H05K3/00; H05K3/0094; H05K3/22; H05K3/28; H05K3/288; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/0959; H05K2203/00; H05K2203/02; H05K2203/025; H05K2203/07; H05K2203/0756; H05K2203/0769; H05K2203/0779; H05K2203/0786; H05K2203/0793
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A method comprising the steps of: (a) contacting a surface of the resin layer with an aqueous alkaline liquid selected from the group consisting of aqueous solution of an alkali carbonate, alkali hydroxide or alkali silicate, having a pH of 9-14 to swell said surface; abrading the resin layer having the swollen surface, step (b) being preceded by or simultaneous with step (a); and (c) then washing the abraded surface with an aqueous neutral liquid.
Claim 2
Independent Claim
75 words
A method comprising the steps of: (a) contacting a surface of the resin layer with an aqueous alkaline liquid selected from the group consisting of aqueous solution of an alkali carbonate, alkali hydroxide or alkali silicate, having a pH of 9-14 to swell said surface; abrading the resin layer having the swollen surface, step (b) being preceded by or simultaneous with step (a); and (c) then washing the abraded surface with an aqueous neutral liquid.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein step (a) is effected by spraying the aqueous alkaline liquid over the surface of the resin layer.
Claim 4
Dependent Claim
23 words
A method according to claim 1, wherein step (b) is effected by using a belt sander, a brush roll or a buff roll.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein step (b) is effected by using a buff roll impregnated with the aqueous alkaline liquid.
Claim 6
Dependent Claim
48 words
A method according to claim 1, wherein the alkali-soluble resin is a hardened resin obtained by photopolymerization of a composition comprising an alkali-soluble polymer, a carboxyl group-containing, monofunctional monomer, a monofunctional monomer or oligomer having one ethylenically unsaturated group but having no carboxyl group, and a photopolymerization initiator.
Claim 7
Dependent Claim
13 words
A method according to claim 1, wherein said aqueous neutral liquid is water.
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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |