Patent US4237172A successfully refreshed from Google Patents.
US4237172A
Expired / Lapsed
US
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Sealing leaks by polymerization of volatilized aminosilane monomers
Assignee: American Patent Group
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Filing: 1978-12-04
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Granted: 1980-12-02
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Expires: 1998-12-04
Abstract
Abstract Leaks in a vessel or pipeline or the like adapted for containing a fluid, are sealed by means of a volatilized polymerizable aminosilane supplied to the interior of the vessel under sufficient pressure and for a sufficient period of time to permit contact thereof and react in the presence of moisture or sand at the situs of the leak to provide a solid polysiloxane seal.
Inventors
- 👤 Joseph J. Packo
- 👤 Donald L. Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:08
CPC Classifications
B; B32; B32B; B32B43/00; C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C09; C09K; C09K3/00; C09K3/12; F; F16; F16L; F16L55/00; F16L55/16; F16L55/168; F16L55/175; Y; Y10; Y10T; Y10T428/00; Y10T428/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
151 words
A method of forming a seal at the situs of a leak located in a vessel by polymerizing an organic monomer at said situs, comprising introducing a sealant consisting essentially of an aminosilane monomer into the interior of said vessel, said aminosilane monomer being readily volatilizable at the ambient temperature of said vessel and having the formula: ##STR6## wherein R is H, halogen or R', and R' is alkyl of 1-4 carbons; R 1 is halogen, R', --OR, --NHR' or --N(R') 2 ; R 2 is halogen, R', --OR, --NHR' or --N(R') 2 ; and R 3 is --NHR' or --N(R') 2 ; said aminosilane monomer being introduced to said vessel under sufficient pressure and for a sufficient period of time to effect contact of said leak situs with said monomer in the vapor state and to effect polymerization of said monomer at said leak situs and sealing of the leak.
Claim 2
Independent Claim
151 words
A method of forming a seal at the situs of a leak located in a vessel by polymerizing an organic monomer at said situs, comprising introducing a sealant consisting essentially of an aminosilane monomer into the interior of said vessel, said aminosilane monomer being readily volatilizable at the ambient temperature of said vessel and having the formula: ##STR6## wherein R is H, halogen or R', and R' is alkyl of 1-4 carbons; R 1 is halogen, R', --OR, --NHR' or --N(R') 2 ; R 2 is halogen, R', --OR, --NHR' or --N(R') 2 ; and R 3 is --NHR' or --N(R') 2 ; said aminosilane monomer being introduced to said vessel under sufficient pressure and for a sufficient period of time to effect contact of said leak situs with said monomer in the vapor state and to effect polymerization of said monomer at said leak situs and sealing of the leak.
Claim 3
Dependent Claim
24 words
A method in accordance with claim 1, comprising, as a preliminary step, flushing said vessel with a moisture laden gas inert to said aminosilane.
Claim 4
Dependent Claim
16 words
A method in accordance with claim 1, wherein said vessel is a pipe buried in sand.
Claim 5
Dependent Claim
17 words
A method in accordance with claim 1, wherein said vessel is a pipe buried in moist earth.
Claim 6
Dependent Claim
12 words
A method in accordance with claim 1, wherein said aminosilane is bis(dimethylamino)methylsilane.
Claim 7
Dependent Claim
23 words
A method in accordance with claim 1, wherein said aminosilane is selected from the group consisting of bis(dimethylamino)dimethylsilane; methoxy-dimethylamino-methylsilane; methoxy-bis(dimethylamino)methylsilane; dimethoxy-dimethylamino-methylsilane; and methoxy-dimethylamino-dimethylsilane.
Claim 8
Dependent Claim
21 words
A method in accordance with claim 1, wherein said aminosilane is a mixture of 1-5% tris-(dimethylamino)methylsilane with the remainder being bis-(dimethylamino)dimethylsilane.
Claim 9
Dependent Claim
17 words
A method in accordance with claim 1, wherein said silane is carried in a gas inert thereto.
Claim 10
Dependent Claim
35 words
A method in accordance with claim 8 wherein said aminosilane is introduced into said vessel in a continuous manner at such a rate that the concentration of the monomer vapor does not exceed 25,000 ppm.
Claim 11
Dependent Claim
18 words
A method in accordance with claim 1, carried out at a temperature of 30° F. to 90° F.
Claim 12
Dependent Claim
23 words
A method in accordance with claim 1, wherein R 1 is R' or --OR'; and R 2 is --OR' or --N(R') 2 .
Claim 13
Dependent Claim
37 words
A method in accordance with claim 1 wherein said vessel is a natural or fuel gas pipe, and said aminosilane is introduced, into natural or fuel gas continuously carried by said gas pipe, in an intermittent manner.
Claim 14
Dependent Claim
10 words
A sealed vessel obtained by the method of claim 1.
Claim 15
Dependent Claim
10 words
A sealed vessel obtained by the method of claim 9.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |