Company Filing History:
Years Active: 1979-1980
Title: Celebrating the Innovations of Donald A. Calleson
Introduction
Donald A. Calleson is a notable inventor based in Durham, NC, who has contributed significantly to the fields of measurement and ventilation technology. With a total of two patents to his name, Calleson's innovations reflect a blend of practicality and ingenuity, serving various industries, including manufacturing and tobacco.
Latest Patents
Calleson’s latest inventions showcase his problem-solving skills and innovative mindset. One of his significant patents is a "Device for Measuring the Circumference of a Cylindrical Rod." This handheld measurement tool allows for accurate measurement of a rod's circumference by guiding the rod through a defined path between two cylinders. An ink marking device places an index mark on the rod, while a transparent scale provides an indication of the distance traveled, allowing for precise calculations of the circumference.
Another noteworthy patent is the "Apparatus for Measuring Smoke Dilution in a Vented-Filter Cigarette." This apparatus operates through a mechanism wherein a puff generator draws smoke and air through a vented-filter cigarette. The design cleverly utilizes a piston that travels to a dead center position, with the piston movement directly correlating to the air drawn through the filter, producing a digital readout of the degree of ventilation.
Career Highlights
Donald A. Calleson is currently affiliated with Liggett Group Inc., a company renowned for its innovations within the tobacco industry. His role allows him to apply his inventive skills in practical applications that benefit his organization.
Collaborations
Throughout his career, Calleson has worked closely with his coworker, Ned A. Sigmon. Their collaboration is reflective of a unique synergy between talented individuals, which often leads to groundbreaking ideas and solutions.
Conclusion
Donald A. Calleson exemplifies the spirit of innovation with his practical inventions that address specific needs within various industries. His contributions not only enhance the efficiency of measurement and ventilation technologies but also inspire a new generation of inventors in the field. As the world continues to evolve, the impact of Calleson's work is sure to resonate within the domains he has touched.