4. Electric lamp and discharge devices: systems
  5. Periodic switch in the supply circuit
  6. Impedance or current regulator in the supply circuit

Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH

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Ballast and method for operating a lamp

Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Reexamination Certificate

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Ballast for operating at least one low-pressure discharge lamp

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Discharge control discharge device load
Reexamination Certificate

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Device for controlling operating means for at least one...

Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate

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Discharge lamp operating circuit having a circuit for...

Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate

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Highly efficient fluorescent material

Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate

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