US Patents of Charles Oppedahl

• 3427520 DC servo amplifier for armature drive motor
• 3355126 Radio beam capture circuit for aircraft guidance
• 3333795 Flare computer
• 3259756 Complementary bridge differential control circuit
• 3247460 DC amplifier utilizing saturable cores
• 3160019 Compensation for gyro pitch signal velocity change errors
• 3131393 Error compensation in radio direction finders

Canadian patents

• 813464 DC SERVO AMPLIFIER FOR ARMATURE DRIVE MOTOR
• 811883 RADIO BEAM CAPTURE CIRCUIT FOR AIRCRAFT GUIDANCE
• 784376 FLARE COMPUTER
• 759158 COMPLEMENTARY BRIDGE DIFFERENTIAL CONTROL CIRCUIT
• 752053 DC AMPLIFIER
• 700505 ERROR COMPENSATION IN RADIO DIRECTION FINDERS