Misery Inc. ended in 2008.
Misery Inc. was created in 2001.
Be Inc. ended in 2001.
Eveready Inc. ended in 2009.
Watermark Inc. ended in 1995.
Lucid Inc. ended in 1994.
Lipps Inc ended in 1985.
Conoco Inc. ended in 2002.
MCA Inc. ended in 1997.
OPTi Inc. ended in 2002.
Friedman's Inc. ended in 2008.
Fire Inc. ended in 1984.
Yes, in American English, a period should be included after the abbreviation "Inc." at the end of a sentence. It signifies the end of the abbreviation and the sentence.