US3661641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing polyurethane resin protective coating
Assignee: Individual
•
Filing: 1969-08-29
•
Granted: 1972-05-09
•
Expires: 1989-08-29
Abstract
Abstract Method of removing a polyurethane resin protective coating from an assembly which may include various types of circuit components and soldered connections, comprising treating the coating with a composition comprising methyl alcohol, ethyl alcohol and toluene until the resin softens sufficiently, and then stripping the softened resin from the assembly. The composition may also include a small proportion of propanol.
Inventors
- 👤 Michael Walter Vigh
- 👤 Harold Thomas Rocheleau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:07
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/032; C09; C09D; C09D9/00; C09D9/005; C11; C11D; C11D7/00; C11D7/50; C11D7/5004; C11D7/5022; H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/288; C11D7/22; C11D7/24; C11D7/26; C11D7/261
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
19 words
A method according to claim 1 in which said composition comprises: 40.75% methanol 40.75% ethanol 16% toluene 2.5% propanol
Claim 2
Dependent Claim
17 words
A method according to claim 1 in which said board is a laminated fiber glass-epoxy resin type.
Claim 3
Dependent Claim
47 words
A method according to claim 1 in which said coating is about 0.03 inch thick, said board is immersed in said composition, said composition is maintained at a temperature of about 52* C., and said board is removed after a period of about 1 to 2 hours.
References Cited (Backward Citations)
US2563417A
Cited
US1884767A
Cited
US2929800A
Cited
US3432451A
Cited
US3248373A
Cited
US3252848A
Cited
US3331718A
Cited
US3341583A
Cited
US3355385A
Cited
US3455855A
Cited
US3335087A
Cited
US3446781A
Cited
US3472802A
Cited
US3551204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |