Virgil E. Johnson Jr.

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Gaithersburg, MD, US

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Patents Grantslast 30 patents

Information Patent Grant
Erosive-jet diver tool
- Patent number 4,716,849
- Issue date Jan 5, 1988
- Tracor Hydronautics, Inc.
- Andrew F. Conn
- B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
Information Patent Grant
Enhancing liquid jet erosion
- Patent number 4,681,264
- Issue date Jul 21, 1987
- Hydronautics, Incorporated
- Virgil E. Johnson
- B08 - CLEANING
Information Patent Grant
Enhancing liquid jet erosion
- Patent number 4,474,251
- Issue date Oct 2, 1984
- Hydronautics, Incorporated
- Virgil E. Johnson
- B08 - CLEANING
Information Patent Grant
Cavitating liquid jet assisted drill bit and method for deep-hole d...
- Patent number 4,391,339
- Issue date Jul 5, 1983
- Hydronautics, Incorporated
- Virgil E. Johnson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Enhancing liquid jet erosion
- Patent number 4,389,071
- Issue date Jun 21, 1983
- Hydronautics, Inc.
- Virgil E. Johnson
- B08 - CLEANING
Information Patent Grant
Cavitating liquid jet assisted drill bit and method for deep-hole d...
- Patent number 4,262,757
- Issue date Apr 21, 1981
- Hydronautics, Incorporated
- Virgil E. Johnson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Movable ramp inlet for water jet propelled ships
- Patent number 3,942,463
- Issue date Mar 9, 1976
- The United States of America as represented by the Secretary of the Navy
- Virgil E. Johnson
- B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT