US4022935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of spraying sealing composition to interior walls of storage tank
Assignee: Individual
•
Filing: 1975-03-12
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Granted: 1977-05-10
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Expires: 1995-03-12
Abstract
Abstract This specification describes a process and apparatus for closing leaks and spraying a sealant composition to interior walls of an underground gasoline tank such as is used in retail gasoline service stations. A gas tank suspected of leaks is emptied of stored gas and purged with compressor air applied thru a valve control and pipe conduit threadly inserted in the conventional fill pipe of the tank. The pipe conduit includes a means defining an aperture at the lower extremity of the conduit which extends into the tank interior. An explosion safety level meter is attached to the pipe conduit for providing a humanly detectable signal of the environment within the tank. An excavation enables a craftsperson to cut an access port through the tank wall for entering the tank interior, cleaning-up residue, sandblasting the interior walls, and spraying a sealant composition of thixotropic polyester resin and a catalyst onto the sandblasted walls.
Inventors
- 👤 Paul W. Kinney
- 👤 Carl Walter Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:53
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/12; B; B29; B29C; B29C73/00; B65; B65D; B65D90/00; C09D; C09D133/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A method of sealing leaks in a storage tank having walls defining an enclosed interior and connected to a fill pipe through which a liquid is admitted to said interior for storage and comprising the steps of emptying said tank interior of stored liquid, admitting a supply of air through said fill pipe for purging any stored liquid residue within said tank interior, determining a safety level of said tank interior through said fill pipe, opening an access port from an exterior to said interior of said tank through said walls, removing residual liquid material from said tank interior. establishing sealant composition adherent surfaces on said walls within said tank interior, and spraying a sealant composition of thixotropic polyester resin and said sealant composition comprises a base resin of neopentyl glycol isophthalic acid corrosion resistant polyester resin, styrene and fumed silica and cobalt octoate, copper naphthenate and lithium chloride, to said adherent surfaces.
Claim 2
Independent Claim
153 words
A method of sealing leaks in a storage tank having walls defining an enclosed interior and connected to a fill pipe through which a liquid is admitted to said interior for storage and comprising the steps of emptying said tank interior of stored liquid, admitting a supply of air through said fill pipe for purging any stored liquid residue within said tank interior, determining a safety level of said tank interior through said fill pipe, opening an access port from an exterior to said interior of said tank through said walls, removing residual liquid material from said tank interior. establishing sealant composition adherent surfaces on said walls within said tank interior, and spraying a sealant composition of thixotropic polyester resin and said sealant composition comprises a base resin of neopentyl glycol isophthalic acid corrosion resistant polyester resin, styrene and fumed silica and cobalt octoate, copper naphthenate and lithium chloride, to said adherent surfaces.
Claim 3
Dependent Claim
40 words
A method in accordance with claim 1 in which said step of admitting said supply of air comprises supplying compressor air and coupling said compressor air through a valve control and said fill pipe to said interior of said tank.
Claim 4
Dependent Claim
44 words
A method in accordance with claim 2 in which said coupling of said compressor air through said valve and said fill pipe to said tank interior comprises channeling said compressor air from said valve control through a pipe conduit inserted in said fill pipe.
Claim 5
Dependent Claim
34 words
A method in accordance with claim 1 in which said step of establishing sealant composition adherent surfaces comprises sandblasting said walls within said interior of said tank to provide sealant composition adherent surfaces thereon.
Claim 6
Dependent Claim
71 words
A method in accordance with claim 1 in which said step of spraying said sealant composition comprises spraying said neopentyl glycol isophthalic acid corrosion resistant polyester resin, styrene and fumed silica from a tip of a spray nozzle in a predetermined proportion onto said adherent surfaces and said cobalt octoate, copper naphthenate and lithium chloride from a separate tip of said spray nozzle in another predetermined proportion onto said adherent surfaces.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |