Donald A. Calleson

Follow

Person

Durham, NC, US

People

Patents Grantslast 30 patents

Information Patent Grant
Device for measuring the circumference of a cylindrical rod
- Patent number 4,185,393
- Issue date Jan 29, 1980
- Liggett Group Inc.
- Donald A. Calleson
- G01 - MEASURING TESTING
Information Patent Grant
Apparatus for measuring smoke dilution in a vented-filter cigarette
- Patent number 4,171,635
- Issue date Oct 23, 1979
- Liggett Group Inc.
- Donald A. Calleson
- A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES