Robert D Ashby

US Patent:

43015018, Nov 17, 1981

Filed:

May 2, 1980

Appl. No.:

6/146058

Inventors:

Larry E. Carter - Westminster CA
Robert M. Ashby - Pasadena CA

Assignee:

American Telecommunications Corporation - El Monte CA

International Classification:

H02M 306

US Classification:

363 62

Abstract:

A capacitor ratio multiplier has a switched capacitor for switching between sampling, sharing and delivering charge modes. During the sampling mode, the switched capacitor receives charge from a port in a circuit. During th sharing mode, the switched capacitor is paralleled by a sharing capacitor and is partially discharged thereby. The switched capacitor is connected to a port in the circuit for delivering charge. The sharing capacitor is discharged prior to sharing charge with the switched capacitor.

US Patent:

42138663, Jul 22, 1980

Filed:

Nov 3, 1978

Appl. No.:

5/957537

Inventors:

Robert M. Ashby - Pasadena CA
Frederick S. Kaveggia - Mission Viejo CA

International Classification:

E21B 4327

US Classification:

252 855C

Abstract:

Petroleum values bound in formations by sulfur scale blocked passages are freed by effectively dissolving the scale and formation rock with a solution containing a primary acid, a catalyst, and, preferably, a chelating or sequestering agent and a wetting agent. The primary acid is preferably hydrochloric. The catalyst is tetravalent or pentavalent vanadium. The chelating agent is at least one member selected from the class consisting of dicarboxylic acid, or tricarboxylic acid, or both acids, and glycerine, wherein the above acid group is always present. The primary acid attacks the sulfur scale and formation rock, and its action is substantially completed because of the catalyst. The chelating or sequestering agent maintains the dissolved minerals in solution. The wetting agent enables mineral penetration.