Company Filing History:
2 out of 392 
1 out of 301 
1 out of 7 Years Active: 1979-1997
Title: John Mark Crowell: Innovator in Seismic Technology
Introduction
John Mark Crowell is a notable inventor based in Friendswood, TX (US). He has made significant contributions to the field of seismic technology, holding a total of 4 patents. His work focuses on enhancing the efficiency and effectiveness of seismic vibrators used in geological exploration.
Latest Patents
One of Crowell's latest inventions is the three-axis seismic vibrator. This device imparts compressional and shear wave seismic vibrations into the Earth's surface, either sequentially or simultaneously. The seismic vibrator features an earth-contacting baseplate that transmits vibrational energy into the ground, a support structure, and a vibrator assembly that is pivotally supported. Additionally, it includes servo-hydraulic control circuits that activate reciprocal and sustained oscillatory vibrations. The vibrations generated are transferred to the baseplate and injected into the Earth's surface, allowing for the analysis of mineral content in the area.
Another significant patent is the removable piston bore liner for hydraulically actuated seismic vibrators. This innovation substantially increases the dependability, flexibility, and field-serviceability of seismic vibrators and other hydraulically actuated devices. The method for installing this removable bore liner enhances the functionality of seismic equipment in the field.
Career Highlights
Throughout his career, John Mark Crowell has worked with prominent companies in the industry, including Western Atlas International, Inc. and Hughes Tool Company LLC. His experience in these organizations has contributed to his expertise in seismic technology and innovation.
Collaborations
Crowell has collaborated with notable individuals in his field, including James Edward Teske and Lee Roy Hodge. These partnerships have likely fostered a creative environment that has led to the development of his innovative patents.
Conclusion
John Mark Crowell's contributions to seismic technology through his patents demonstrate his commitment to advancing the field. His inventions not only enhance the capabilities of seismic vibrators but also play a crucial role in geological exploration.