Ewing Laporte, 85, a Washington lawyer for 53 years before his retirement last year, died of congestive heart failure Monday at Georgetown University Hospital.

In 1920-21, Mr. Laporte served as an assistant secretary of the Treasury.

He had a private law practice here from 1923 to 1933 and then became Pennsylvania state manager for the Home Owners Loan Corp. in Pittsburgh. He subsequently became regional manager for New York, New Jersey and Connecticut before returning here in 1936 to resume his general law practice.

Mr. Laporte, who had a French father and an American mother, was born in Normandy, France. He was brought to this country at the stage of three.

He attended Yale University and earned a bachelor's degree from the Universtiy of Pittsburg, which he served as financial secretary in 1921-22. He earned a law degree from George Washington University in 1916 and worked as a deputy sergeant at arms for the U.S. Senate while attending the universtiy.

Before being appointed an assistant secretary of the Treasury, he worked for the old Bureau of Internal Revenue's war risk insurance and customs bureaus.

Mr. Laporte served as executive secretary of the Democratic National Convention in 1932.

He lived in Washington and was a member of the D.C. and Pennsylvania Bar Associations.

Survivors include his wife, Themla W., of Washington; two daughters, Lucile L. Farine of Gentry, Ark., and Ann L. Thompson of Arlington; a brother, Leon C., of La Jolla, Calif., and five grandchilden.