The only hint to the name of the company that I can find is in Christmas Vacation. In a scene where Clark is in his office, you can see awards for "Designer of the Year" given to Clark from the Society of Food Additives. I doubt that would be the name of the company he works at, but who knows?
Harry W. Griswold was born in 1886.
Norman W. Griswold has written: 'Beauties of California' -- subject(s): Pictorial works
Harold W. Clark died in 1986.
Harold W. Clark was born in 1891.
Ambrose W. Clark was born in 1810.
Ambrose W. Clark died in 1887.
Ronald W. Clark died in 1987.
Ronald W. Clark was born in 1916.
W. B. Clark has written: 'The promise of the spirit'
W. Clark RUSSELL has written: 'Sailor's language'
Davis W. Clark has written: 'Mental Discipline'
Clark W. McDonnell died on 1952-05-15.