1931 Improvements relating to Telephone Instrument Circuits (Application 1931) GB363512A (in the Name of Siemens)

1932 Improvements relating to Telephone Circuits (Application 1931) GB372400A (in the Name of Siemens)

1932 Improvements of the Carbon Microphone (Application 1932) GB383348A (in the Name of Siemens)

1933 Telephone Instrument Circuit (Application 1932) US1919314 (In the Name of Siemens

1933 Circuit d’instrument telephonique Canada Patent 332048 (In the Name of Siemens)

1934 Improvements in or relating to Telephone Instrument Circuits (Application 1933) GB407808A (in the Name of Siemens)

1934 improvements relating to Electric bells (Application 1934) GB420549A (in the Name of Siemens)

1935 Improvements in or relating to Telephone Instrument Circuits (Application 1934) GB425566A (in the Name of Siemens)

1935 Telephone instrument circuit ,Canada Patent 353848 (In the name of Siemens)

1935 Microphone, Canada Patent 348881 (In the Name of Siemens)

1936 Improvements in Means for Detecting Observing Measuring or Indicating Minute Movements (Application 1934) GB443485A

1937 Means for Guaging Minute displacements (Application 1935) US2073913

1937 Telephone Instrument Circuit (Application 1935) US2099381 (In the Name of Siemens)

1940 Improvements in and relating to Thermionic Valve Oscillators and Amplifiers (Application 1939) GB524314A

1942 Oscillateures et amplificateurs a valve thermionique (Application 1942) FR873458A

1945 Adjustable electrical phase-shifting network US2623945

1945 Improvements in and relating to Electrical Networks (Application 1944) GB573615A

1947 Improvements in and relating to Adjustable Electrical Phase-shifting Networks (Application 1946) GB587714A

1948 Improvements in or relating to Electronic Integrating Apparatus (Application 1946) GB597531A

1949 Improvements to or relating to Spring Assemblages (Application 1945) GB617076A

1949 Linkage for the Generation of Involute-like Curves (Application 1947) GB630243A

1950 Improvements in Means for Measuring Indicating or Utilising Very Small Displacements (Application1947) GB635633A (In the Name of the Ministry of Supply)

1950 Improvements in or relating to Electric measuring Circuits (Application 1949) GB637487A (In the Name of Ministry of Supply)

1951 Improvements in Loudspeakers or Telephone receivers (Application 1948) GB659001A (in the name of National Research and Development Corporation)

1951 Improvements relating to shaft couplings (Application 1948) GB651500A (in the Name of NRDC)

1951 Means for Indicating or Controlling Small Angles of Rotation of a Shaft (Application 1948) GB656270A (in the Name of NRDC)

1951 Thermionic valve Oscillator and Amplifier (Application 1947) US2549553

1952 Improvements in or relating to Shock Absorbing Springs (Application 1949) GB665741A (In the Name of Ministry of Supply)

1952 Improvements relating to Mechanical Displacement - Magnifying Systems (Application 1949)  GB674856A (In the Name of NRDC)

1952 Adjustable electrical phase-shifting network (Application 1946) US2623945

1953 Improvements in Snap Action Switches (application 1949) GB689454A (in the Name of the NRDC)

1954 Improvements in and relating to Indicating Scales (Application 1950) GB708175A (In the name of the BBC)

1954 Improvements in and relating to Optical Systems for Galvanometers and the like (Application 1950) GB704150A (In the Name of the BBC)

1957 Improvements in or relating to Attenuators (Application 1954) GB786189A (In the Name of Muirheads)

1957 Thermionic Voltmeter for Alternating Voltages (Application 1954) GB783967A (In the Name of Muirheads)

1958 Attenuators (Application 1954) US2854643 (In the Name of Muirheads)

1959 Improvements in or relating to Voltage Limiting Apparatus (Application 1957) GB822762A

1961 Improvements in or relating to Electrical Components (Application 1958) GB864264A

1963 Improvements in and relating to Shock-Absorbers and the like (Applications 1959) GB915093A

1963 Improvements in and relating to Voltage or Current Dividing Networks (Application 1958) GB923373A

1964 Shock-Absorbers and the like (Application 1960) US3135506

1965 Improvements in Potentiometric Measuring Circuits (Application 1962) GB1008482A (in the Name of Griffin and George)

1966 Improvements relating to the Measurement of Electrical Impedance (Application 1963) GB1025940A

1966 Resistance Capacitance type oscillators and Selective amplifiers (Application 1963) GB1025709A

1967 Means for controlling the amplitude of electrical signals (Application 1964) GB1096196A (In the Name of BBC)