Patent US4036170A successfully refreshed from Google Patents.
US4036170A
Expired / Lapsed
US
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Means for applying zinc stearate coatings to the bore surfaces of ferrous alloy tubes
Assignee: Government of the United States of America
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Filing: 1975-10-10
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Granted: 1977-07-19
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Expires: 1995-10-10
Abstract
Abstract In order to form an adherent coating of zinc stearate on the bore surfaces of a plurality of tubes grouped in parallel relation, an alkali cleaner solution is circulated therethrough from a reservoir tank and then returned to the tank by a flow of purge air which is thereafter vented to the atmosphere to remove any alkali residue from the system. A phosphate solution, an alkali neutralizer solution, and a stearate solution are, in turn, similarly circulated and returned to their respective reservoir tanks. Each circulation is followed by a corresponding circulation of hot rinse water which is also returned to its reservoir tank by the same air purge technique.
Inventors
- 👤 Harold Goodheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:24
CPC Classifications
B; B05; B05C; B05C7/00; B05C7/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
188 words
In a system for successively flowing each of a plurality of individually stored treatment fluids through a series of parallel tubes, with a minimum of contamination between successive fluids, the combination of, a plurality of multiport valves connected to form a manifold adjacent each of the opposite ends of the tubes in respective communication with each of the treatment fluids, switch means for activating corresponding valves in each of said manifolds to establish a flow path between the tubes and one of the treatment fluids, pump means interposed between each of the stored treatment fluids and said manifold nearest thereto for circulating the selected fluid through the tubes in response to the actuation of said switch means, valve means in one of said manifolds for introducing pressurized air into said established flow path to force said selected treatment fluid back to the initial storage position thereof, and vent means in the other of said manifolds for exhausting said pressurized air from said flow path to thereby purge any residue of said selected treatment fluid therein prior to the circulation of the next selected treatment fluid through the tubes.
Claim 2
Dependent Claim
188 words
In a system for successively flowing each of a plurality of individually stored treatment fluids through a series of parallel tubes, with a minimum of contamination between successive fluids, the combination of, a plurality of multiport valves connected to form a manifold adjacent each of the opposite ends of the tubes in respective communication with each of the treatment fluids, switch means for activating corresponding valves in each of said manifolds to establish a flow path between the tubes and one of the treatment fluids, pump means interposed between each of the stored treatment fluids and said manifold nearest thereto for circulating the selected fluid through the tubes in response to the actuation of said switch means, valve means in one of said manifolds for introducing pressurized air into said established flow path to force said selected treatment fluid back to the initial storage position thereof, and vent means in the other of said manifolds for exhausting said pressurized air from said flow path to thereby purge any residue of said selected treatment fluid therein prior to the circulation of the next selected treatment fluid through the tubes.
Claim 3
Independent Claim
227 words
A system for coating the interior surface of a plurality of ferrous alloy tubes with an adherent layer of zinc stearate, comprising, a plurality of storage reservoirs for each of the fluids involved in treating the ferrous interiors of the tubes to produce the zinc stearate coating thereon, a plurality of three-way valves connected in a double row to form a first and a second manifold in direct communication with each of said storage reservoirs, switch means for selectively energizing corresponding valves in said manifolds to establish a flow path between one of said storage reservoirs and the tubes, pump means interposed between each of said storage reservoirs and said three-way valves in said first manifold and responsive to said switch means for circulating one of said treatment fluids through the tubes to said second manifold and back to said storage reservoir, a two-way valve connected to one end of said second manifold for introducing pressurized air into said established flow path to force said treatment fluid therein back to said storage reservoir therefor, and a vent valve connected to one end of said first manifold for exhausting said pressurized air from said established flow path to purge any residual treatment fluid from the tubes and said manifolds prior to actuation of said switch means for selecting said next treatment fluid to be circulated through the tubes.
Claim 4
Independent Claim
227 words
A system for coating the interior surface of a plurality of ferrous alloy tubes with an adherent layer of zinc stearate, comprising, a plurality of storage reservoirs for each of the fluids involved in treating the ferrous interiors of the tubes to produce the zinc stearate coating thereon, a plurality of three-way valves connected in a double row to form a first and a second manifold in direct communication with each of said storage reservoirs, switch means for selectively energizing corresponding valves in said manifolds to establish a flow path between one of said storage reservoirs and the tubes, pump means interposed between each of said storage reservoirs and said three-way valves in said first manifold and responsive to said switch means for circulating one of said treatment fluids through the tubes to said second manifold and back to said storage reservoir, a two-way valve connected to one end of said second manifold for introducing pressurized air into said established flow path to force said treatment fluid therein back to said storage reservoir therefor, and a vent valve connected to one end of said first manifold for exhausting said pressurized air from said established flow path to purge any residual treatment fluid from the tubes and said manifolds prior to actuation of said switch means for selecting said next treatment fluid to be circulated through the tubes.
Claim 5
Dependent Claim
56 words
The system defined in claim 2 wherein the termination of operation of said pump means in said established flow path through said first manifold automatically closes said corresponding three-way valve in said second manifold to thereby provide a flow path for said pressurized air to return said circulating treatment fluid back to said storage reservoir therefor.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |