David T. Llewellyn

Person

Ebensburg, PA, US

People

Patents Grantslast 30 patents

Information Patent Grant
Pressure operated switch construction and method of making the same
- Patent number 5,310,970
- Issue date May 10, 1994
- Robertshaw Controls Company
- William J. Kaigler
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Pressure operated switch construction and method of making the same
- Patent number 5,198,632
- Issue date Mar 30, 1993
- Robertshaw Controls Company
- William J. Kaigler
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of making a pressure operated switch
- Patent number 5,140,742
- Issue date Aug 25, 1992
- Robertshaw Controls Company
- William J. Kaigler
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Pressure operated switch construction and method of making
- Patent number 5,136,129
- Issue date Aug 4, 1992
- Robertshaw Controls Company
- William J. Kaigler
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of making a cyclable electrical switch construction
- Patent number 4,993,144
- Issue date Feb 19, 1991
- Robertshaw Controls Company
- David T. Llewellyn
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Switching system for plural load circuit
- Patent number 4,883,983
- Issue date Nov 28, 1989
- Robertshaw Controls Company
- David T. Llewellyn
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of making a water level control device
- Patent number 4,800,633
- Issue date Jan 31, 1989
- Robertshaw Controls Company
- Thomas M. Buckshaw
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Water level control device and method of making the same
- Patent number 4,696,204
- Issue date Sep 29, 1987
- Robertshaw Controls Company
- Thomas M. Buckshaw
- H01 - BASIC ELECTRIC ELEMENTS

David T. Llewellyn

Person

Patents Grantslast 30 patents

Pressure operated switch construction and method of making the same

Pressure operated switch construction and method of making the same

Method of making a pressure operated switch

Pressure operated switch construction and method of making

Method of making a cyclable electrical switch construction

Switching system for plural load circuit

Method of making a water level control device

Water level control device and method of making the same