Two Embossed Blue Milk of Magnesia Bottles.

Five-Inch Tall Milk of Magnesia Bottle

Embossed:  MILK OF MAGNESIA

Trade Mark symbol

REC'D IN U.S. PATENT OFFICE

AUG. 21. 1906.

THE CHAS. H. PHILLIPS

CHEMICAL COMPANY

GLENBROOK.  CONN.

In 1885, The Phillips Camphor and Wax Company incorporated as the Charles H. Phillips Chemical Company. After Phillips died of apoplexy in 1888, his four sons continued to operate the business. In 1923—fifty years after Phillips patented Milk of Magnesia—the pharmaceutical giant, Sterling Products Corporation, bought the Charles H. Phillips Chemical Company. It quickly added Phillips Milk of Magnesia Toothpaste, Phillips Dental Magnesia Tooth Powder, and Phillips Milk of Magnesia Tablets. Heavy advertising, particularly of the original product, bolstered their national presence.

The Sterling Drug Company continued production in Stamford until 1976, when it shifted its operations to Gulfport, Mississippi. In 1994, Bayer AG acquired the over-the-counter U.S. business division of Sterling Winthrop from the British firm Smith Kline Beecham. The purchase included Phillips Milk of Magnesia and its iconic blue bottle.

Here is the link for more about that.

Phillips’ Milk of Magnesia Originated in Stamford - Connecticut History | a CTHumanities Project 

Nine-Inch Tall Milk of Magnesia Company.

\