1836 to 1978
Founded 1836 and incorporated 1878 or 1885 as J. B. Lippincott Company
--Wikipedia, which also uses "J. B. Lippincott & Co.", and gives both dates
Acquired by Harper & Row
1872 newspaper advertisement "J. B. Lippincott & Co. // Have Just Published" shows footer (centered and wrapped, quote):
Nos. 715 and 717 Market-st., Philadelphia, and No. 25 Bond-st., New York.
Successor to Frederick A. Stokes Company
by 1943 acquisition, Lippincott reissued some books with no stated date except the copyright year. Some may be stated first editions, presumably meaning either unrevised or first issued as Lippincott.
In 1978 J. B. Lippincott was sold to Harper & Row. The company was then sold to Wolters Kluwer in 1990 who merged it with Raven Publishers and then with Williams & Wilkins to form Lippincott Williams & Wilkins in 1998.
Joshua Ballinger Lippincott
Grandson Joshua Wharton
(1887–1976) joined the company "for 50 years, including as President from 1927 until 1948, and then as Chairman of the Board until his retirement in 1958".
Joseph Wharton Lippincott, Jr.
(1914–2003) joined 1937 and as president oversaw its expansion and its 1972 transition to the public company that Harper & Row acquired in 1978.