He was sworn in as vice president March 4, 1841 & as president April 6, 1841
Tyler 
became president after Harrison's death in April 1841, only a month ..... Tyler was 
sworn in on March 4, 1841, in the Senate chamber, and delivered... [DOC] [TLE] Tyler is inaugurated as 10th president - Apr 06, 1841 - HISTORY.com [PAR] On this day in 1841, John Tyler is sworn in as president.