Company Filing History:
Years Active: 1980
Title: Claude D Johnson: Innovator in Time and Temperature Indicators
Introduction
Claude D Johnson is a notable inventor based in Arden, NC (US). He has made significant contributions to the field of time and temperature indicators, holding a total of 2 patents. His innovative designs reflect a deep understanding of materials and their interactions under varying conditions.
Latest Patents
Johnson's latest patents include the Elapsed Time Indicator and the Freeze Indicator. The Elapsed Time Indicator is designed to provide a time measurement that remains largely unaffected by temperature variations. It utilizes a silicone oil that is absorbed onto a porous strip, moving at a rate that corresponds to time. The strip is printed with oil-soluble ink on one side, while the other side remains unprinted. As the silicone oil travels up the strip, it interacts with the ink, causing a dye to migrate and create a visible color front. This innovative design ensures accurate time indication despite environmental changes.
The Freeze Indicator, on the other hand, features a frangible ampule filled with a mixture of water, a nucleating agent, and a surfactant. When the temperature reaches the freezing point, the water freezes and expands, breaking the ampule. The nucleating agent helps to overcome the undercooling effect, while the surfactant increases the contact area between the water and the nucleating agent. This design allows for a clear color change on a pad with a water-soluble dye, indicating the freezing event effectively.
Career Highlights
Johnson is associated with Akzona Incorporated, where he has applied his inventive skills to develop practical solutions for temperature and time measurement. His work has contributed to advancements in various applications, showcasing his ability to innovate in challenging environments.
Collaborations
Throughout his career, Johnson has collaborated with notable colleagues, including Robert L Lilly and Gerardus L Tummers. These partnerships have likely enriched his work and led to further innovations in his field.
Conclusion
Claude D Johnson stands out as an inventor whose work in time and temperature indicators has made a significant impact. His patents reflect a commitment to innovation and practical solutions, demonstrating his expertise in the field.