Patent US3709712A successfully refreshed from Google Patents.
US3709712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of sealing leaks
Assignee: Individual
•
Filing: 1971-01-06
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Granted: 1973-01-09
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Expires: 1991-01-06
Abstract
Abstract Leaks in pipelines, conduits, tanks, vessels and the like are sealed by introducing ammonia gas under pressure into such equipment which will escape through any existing leaks and react with an aqueous metal salt solution supplied at the external site of the leak to form a solid reaction product which seals the leak. Ammonia gas admixed with carbon dioxide gas may also be used in this process to produce complex solid reaction products for sealing leaks.
Inventors
- 👤 J Rossman
- 👤 National Bank Provident
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:12
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/164
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
29 words
The process of claim 1 wherein the aqueous solution of the metal salt is retained at the external locus of the leak in an absorbent porous solid inert vehicle.
Claim 2
Dependent Claim
30 words
The process of claim 1 wherein the equipment is buried in the ground and the ground is soaked at the locus of a leak with said aqueous metal salt solution.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the gas is ammonia gas.
Claim 4
Dependent Claim
44 words
The process of claim 1 wherein the water-soluble metal salt is selected from the group consisting of the respective chloride, sulfate and nitrate salts of iron, copper, nickel, cobalt, lead, cadmium, manganese, zinc, tin, bismuth, mercury, magnesium, aluminum, antimony, calcium, strontium, barium, and chromium.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein ammonia gas is first introduced into the equipment and then carbon dioxide gas is introduced.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein a volatile alkyl amine is introduced into the equipment.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |