US3666670A
Expired / Lapsed
US
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Pulverulent drain cleaning composition
Assignee: Vulcan Materials Co
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Filing: 1969-08-01
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Granted: 1972-05-30
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Expires: 1989-08-01
Abstract
Abstract A free flowing, pulverulent drain cleaning composition is made by mixing an alkali metal hydroxide such as caustic soda; a halogenated lower aliphatic hydrocarbon such as perchloroethylene, methylene chloride or methylchloroform; particulate silica; and a wetting agent.
Inventors
- 👤 Daniel Eugene Gilbert
- 👤 Larry Ralph Nelson
- 👤 Charles Edwin Sturgeon
- 👤 Robert Keith Thom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:37
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5004; C11D7/5018; C11D3/00; C11D3/0005; C11D3/0052; C11D7/02; C11D7/04; C11D7/06; C11D7/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A pulverulent drain cleaning composition according to claim 1 consisting essentially of: a. about 15 to 80 percent of substantially anhydrous caustic soda or caustic potash, b. about 20 to 85 percent of a chlorinated alkane or alkene hydrocarbon possessing from one to two carbon atoms and from two to four chlorine atoms per molecule, c. about 1 to 15 percent of finely divided adsorbent silica having a surface area in the range between about 50 m2/g to 400 m2/g, the amount of said silica being sufficient to adsorb the liquid chlorinated hydrocarbon and produce a substantially dry, free flowing mixture, and d. about 0.5 to 5 percent of a wetting agent selected from the group consisting of anionic, cationic, and non-ionic wetting agents.
Claim 2
Dependent Claim
12 words
A composition according to claim 2 wherein the alkali is caustic potash.
Claim 3
Dependent Claim
12 words
A composition according to claim 2 wherein the chlorinated hydrocarbon is perchloroethylene.
Claim 4
Dependent Claim
12 words
A composition according to claim 2 wherein the chlorinated hydrocarbon is trichloroethylene.
Claim 5
Dependent Claim
12 words
A composition according to claim 2 wherein the chlorinated hydrocaRbon is methylchloroform.
Claim 6
Dependent Claim
92 words
A free flowing drain cleaning composition according to claim 2 consisting essentially of: a. about 40 to 60 percent of powdered sodium hydroxide, b. about 40 to 55 percent of a chlorinated hydrocarbon selected from the group consisting of methylene chloride, trichloroethylene, tetrachloroethylene and methylchloroform, c. about 4 to 12 percent of fumed silica possessing a surface area in the range between about 175 and 350 m2/g, and d. about 1 to 2 percent of a solid wetting agent selected from the group consisting of sodium alkaryl sulphonates and sodium alkyl sulfates.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |