Be Inc. ended in 2001.
MCA Inc. ended in 1997.
Conoco Inc. ended in 2002.
Lipps Inc ended in 1985.
OPTi Inc. ended in 2002.
Misery Inc. ended in 2008.
Friedman's Inc. ended in 2008.
Fire Inc. ended in 1984.
Watermark Inc. ended in 1995.
Lucid Inc. ended in 1994.
Eveready Inc. ended in 2009.
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.
Pro Arts Inc. ended in 1984.