US4438227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and method of masking
Assignee: NALL JAMES 5831 PORTOBELLO COURT SAN DIEGO
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Filing: 1982-10-04
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Granted: 1984-03-20
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Expires: 2002-10-04
Abstract
Abstract A composition and method of application of the composition to produce masks of the type particularly useful in the manufacture of varnished electronic terminals and components is specified. The composition consists of mixing acetone, nitrocellulose, methyl isobutyl ketone (MIBK), arylsulfonamide formaldehyde resin, and tri (b-chloroethyl) phosphate, a fire retardant, under carefully controlled conditions. This masking product is applied, prior to the varnish, on an electronic part and is subjected to heating in the varnish curing oven to about 200° F. whereupon the masking product will carbonize. The resulting carbonized coating is easily removed by brushing to produce a varnish mask where the masking product was applied.
Inventors
- 👤 James B. Nall
- 👤 Jeffery J. King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:58
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/32; C; C09; C09D; C09D101/00; C09D101/08; C09D101/16; C09D101/18; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S524/00; Y10S524/905
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
127 words
In the manufacture of an electrical or electronic component which includes the application of a varnish or other insulating and sealing compound to the surface of said component by either dipping, brushing or spraying method, a process, for preventing the adhesion of said compound to certain areas of said component and for conditioning them for good electrical contact, which comprises: prior to said application, contacting said areas with a masking hydrophobic mixture comprising essentially: a volatile organic solvent sufficient to solvate the mixture; nitrocellulose; a formaldehyde based resin, and a phosphate fire retardant; applying said compound to said surface; curing said compound and carbonizing said mixture by heating said component to at least 93° C.; and brushing away said carbonized mixture and overlying compound from said areas.
Claim 2
Dependent Claim
127 words
In the manufacture of an electrical or electronic component which includes the application of a varnish or other insulating and sealing compound to the surface of said component by either dipping, brushing or spraying method, a process, for preventing the adhesion of said compound to certain areas of said component and for conditioning them for good electrical contact, which comprises: prior to said application, contacting said areas with a masking hydrophobic mixture comprising essentially: a volatile organic solvent sufficient to solvate the mixture; nitrocellulose; a formaldehyde based resin, and a phosphate fire retardant; applying said compound to said surface; curing said compound and carbonizing said mixture by heating said component to at least 93° C.; and brushing away said carbonized mixture and overlying compound from said areas.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the volatile organic solvent comprises volatile organic solvents of the ketone type.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the volatile organic solvent comprises acetone and methyl isobutyl ketone.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the formaldehyde based resin comprises arylsulfonamide formaldehyde resin.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the phosphate fire retardant comprises tri (b-chloroethyl) phosphate.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the nitrocellulose comprises nitrocellulose known as nitrocellulose RS 1/4.
Claim 8
Dependent Claim
59 words
The process of claim 1 comprising: volatile organic solvents sufficient to solvate the mixture; nitrocellulose in a proportion by weight of the mixture between 2 and 80%; formaldehyde type resin in a proportion by weight of the mixture between 1 and 50%; and phosphate type fire retardant in a proportion by weight of the mixture between 1 and 80%.
Claim 9
Dependent Claim
16 words
The process of claim 7 wherein the nitrocellulose comprises the nitrocellulose known as nitrocellulose RS 1/4.
Claim 10
Dependent Claim
20 words
The process of claim 7 wherein the formaldehyde type resin comprises the formaldehyde type resin known as arylsulfonamide formaldehyde resin.
Claim 11
Dependent Claim
22 words
The process of claim 7 wherein the phosphate type fire retardant comprises the phosphate type fire retardant known as tri (b-chloroethyl) phosphate.
Claim 12
Dependent Claim
77 words
The process claimed in claim 7 wherein said mixture comprises: ketone solvents selected from the group consisting of acetone, methyl ethyl ketone (MEK), methyl isobutylketone (MIBK) sufficient to solvate the mixture; nitrocellulose in a proportion by weight of the mixture of between 5 and 45%; formaldehyde type resin in a proportion by weight of the mixture between 1 and 25%; and phosphate type fire retardant in a proportion by weight of the mixture between 1 and 20%.
Claim 13
Dependent Claim
16 words
The process of claim 11 wherein said mixture comprises the nitrocellulose known as nitrocellulose RS 1/4.
Claim 14
Dependent Claim
18 words
The process of claim 11 wherein said mixture comprises the formaldehyde type resin known as arylsulfonamide formaldehyde resin.
Claim 15
Dependent Claim
19 words
The process of claim 11 wherein said mixture comprises the phosphate type fire retardant known as tri (b-chloroethyl) phosphate.
Claim 16
Dependent Claim
71 words
The process claimed in claim 7 wherein said mixture comprises essentially: acetone in a proportion by weight of between 40 and 60%; nitrocellulose in a proportion by weight of between 10 and 40%; methylisobutyl ketone in a proportion by weight of between 1 and 10%; a formaldehyde type resin in a proportion of between 2 and 20%; and a phosphate type fire retardant in a proportion of between 2 and 10%.
Claim 17
Dependent Claim
58 words
The process claimed in claim 15 wherein said mixture comprises essentially: acetone in a proportion of 51.5% by weight; nitrocellulose RS 1/4 in a proportion of 28.1% by weight methyl-isobutyl hetone in a proportion of 4.9 by weight; tri-(b-chloroethyl) phosphate in a proportion of 9.4% by weight; and arylsulfonamide formaldehyde resin in a proportion of 6.7% by weight.
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) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |