Company Filing History:
2 out of 1,426 
1 out of 3 Years Active: 1977-1983
Title: The Innovative Contributions of David L. Gruller
Introduction
David L. Gruller is a notable inventor based in Houston, Texas, recognized for his significant contributions to the field of well technology. With a total of three patents to his name, Gruller has developed innovative solutions that enhance the efficiency and safety of well operations.
Latest Patents
Gruller's latest patents include the "Holddown and Packoff Apparatus" and the "Holddown Apparatus." The Holddown and Packoff Apparatus is designed to be positioned on the shoulder of a hanger that suspends casing in a well. This apparatus engages a seat in the bore of a wellhead, featuring an expansible metal ring that slides on the hanger shoulder to engage an annular groove in the wellhead. A stop ring can be inserted behind the expansible ring to ensure it holds firmly in place. Additionally, an independent sealing assembly is included, which has two seals operating in series to maintain effective sealing without interference. The Holddown Apparatus, on the other hand, is mounted on a hanger that suspends a string of casing or tubing into a well. It features a rigid, radially expansible locking ring and a cam ring that work together to provide a positive holddown, allowing for secure locking of the hanger during cementing operations.
Career Highlights
Throughout his career, David L. Gruller has worked with prominent companies in the industry, including Smith International, Inc. and Zap-Lok Systems International, Inc. His experience in these organizations has contributed to his expertise in well technology and innovation.
Collaborations
Gruller has collaborated with notable individuals in his field, including John H. Fowler and Marvin C. Echols. These partnerships have likely fostered the exchange of ideas and advancements in technology.
Conclusion
David L. Gruller stands out as an influential inventor whose work has significantly impacted well technology. His patents reflect a commitment to innovation and safety in the industry.