US3706691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depotting solvent
Assignee: United States Department of the Navy
•
Filing: 1970-09-04
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Granted: 1972-12-19
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Expires: 1990-09-04
Abstract
Abstract Encapsulating (potting) compositions which contain a linkage that is susceptible to hydrolytic cleavage; i.e., polyamides, polyesters and polyester base type polyurethanes, and which have deteriorated due to exposure to a hot, moist atmosphere are dissolved by contacting with a solvent comprising a solution of benzyltrimethylammonium hydroxide preferably containing a constituent selected from the group consisting of (a) tetrahydrofuran and acetone, (b) methylene chloride (c) methylene chloride and acetone and (d) N-methyl-2-pyrollidone.
Inventors
- 👤 James V Duffy
- 👤 Porter W Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/032; C23G5/036; C08; C08J; C08J11/00; C08J11/04; C08J11/06; C08J11/08; C09; C09D; C09D9/00; C09D9/005; C23G5/028; C23G5/02806; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
solvent according to claim 1 which consists essentially of benzyltrimethyl-ammonium hydroxide and N-methyl-2-pyrollidone.
Claim 2
Dependent Claim
23 words
A solvent according to claim 2 wherein between about 0.06 -0.2 parts by weight of benzyltrimethylammonium hydroxide are present per part of N-methyl-2-pyrollidone.
Claim 3
Independent Claim
24 words
A method of dissolving potting compositions consisting essentially of contacting said potting composition with a solvent comprising a solution of benzyltrimethylammonium hydroxide and methanol.
Claim 4
Dependent Claim
33 words
A method according to claim 4 within said solvent contains a constituent selected from the group consisting of (a) tetrahydrofuran and acetone, (b) methylene chloride, (c) methylene chloride and acetone and (d) N-methyl-2-pyrollidone.
Claim 5
Dependent Claim
16 words
A method according to claim 5 wherein said solvent consists essentially of benzytrimethylammonium hydroxide and N-methyl-2-pyrollidone.
Claim 6
Dependent Claim
23 words
A method according to claim 6 wherein between about 0.06 -0.2 parts by weight of benzyltrimethylammonium hydroxide are present per part of N-methyl-2-pyrollidone.
Claim 7
Dependent Claim
10 words
A solvent according to claim 1 which additionally contains methanol.
Claim 8
Dependent Claim
10 words
A solvent according to claim 2 which additionally contains methanol.
Claim 9
Dependent Claim
10 words
A solvent according to claim 3 which additionally contains methanol.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |