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US 4,052,513 AGranted
Stable topical anesthetic compositions
AssigneePlough, Inc.
InventorCarl Kaplan
Life of this patent
Estimating the term…
Abstract
A cosmetically elegant and stable oil in water emulsion for use as a topical anesthetic containing 0.5-15% benzocaine solubilized in water with a dialkyl ester of an alkanedioic acid having the formula ROOC--C.sub.n H.sub.2n --C00R' where R and R' are alkyl groups of from 1 to 4 carbon atoms and n is an integer from 1 to 8.
Claims10
A stable cosmetically elegant oil in water emulsion useful as a topical anesthetic comprising 0.5 to 15 percent of benzocaine;
- 5 to 40 percent of a cosmetically acceptable dialkyl ester of an alkanedioic acid which is a liquid at 10.degree. C and having the formula ROOC--C.sub.n H.sub.2n --COOR', where R and R' are alkyl groups of from 1 to 4 carbon atoms and n is an integer from 1 to 8;
- at least one cosmetically acceptable surfactant, and water.
Dependencies are inferred from the claim text.