Patent US2428873A successfully refreshed from Google Patents.
US4032362A
Expired / Lapsed
US
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Method of stripping thermoset polymers with molten lactams
Assignee: Westinghouse Electric Corp
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Filing: 1975-12-23
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Granted: 1977-06-28
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Expires: 1995-12-23
Abstract
Abstract Thermoset aromatic ethers and other thermoset polymers are stripped from an article by immersing the article in a molten compound of the general formula: ##STR1## WHERE N IS AN INTEGER FROM 5 TO 7. Caprolactam is an especially useful stripping compound.
Inventors
- 👤 Leonard E. Edelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:18
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/50; C; C09; C09D; C09D9/00; C09D9/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
33 words
A method of removing a thermoset polymer deposited on an article comprising immersing the article in a molten compound having the general formula ##STR4## where n is an integer from 5 to 7.
Claim 2
Independent Claim
33 words
A method of removing a thermoset polymer deposited on an article comprising immersing the article in a molten compound having the general formula ##STR4## where n is an integer from 5 to 7.
Claim 3
Dependent Claim
9 words
A method according to claim 1 wherein n= 5.
Claim 4
Dependent Claim
14 words
A method according to claim 1 wherein said thermoset polymer is an aromatic polyether.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein said molten compound is at about 200° to about 250° C.
Claim 6
Dependent Claim
23 words
A method according to claim 1 wherein said article is a electrical apparatus having coils of insulted wires imbedded in a laminated core.
Claim 7
Dependent Claim
19 words
A method according to claim 5 including the initial step of severing at least one end of said coils.
Claim 8
Dependent Claim
27 words
A method according to claim 1 including the additional last steps of removing said article from said molten compound and cleaning said molten compound off said article.
Claim 9
Independent Claim
106 words
A method of removing the coils from a electrical apparatus having coils of wire insulated with a thermoset resin imbedded in a laminated core comprising: (1) severing at least one end of said coils; (2) immersing said apparatus in a lactam heated between about 150° and about 250° C. which has the general formula ##STR5## where n is an integer from 5 to 7; until the insulation of said coils is substantially destroyed; (3) in either order (a) removing said laminated core from said lactam and (b) removing the wire of said coils from said laminated core; and (4) cleaning said lactam off said laminated core.
Claim 10
Independent Claim
106 words
A method of removing the coils from a electrical apparatus having coils of wire insulated with a thermoset resin imbedded in a laminated core comprising: (1) severing at least one end of said coils; (2) immersing said apparatus in a lactam heated between about 150° and about 250° C. which has the general formula ##STR5## where n is an integer from 5 to 7; until the insulation of said coils is substantially destroyed; (3) in either order (a) removing said laminated core from said lactam and (b) removing the wire of said coils from said laminated core; and (4) cleaning said lactam off said laminated core.
Claim 11
Dependent Claim
14 words
A method according to claim 8 wherein said cleaning step comprises washing with 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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |