Growing community of inventors

Eindhoven, Netherlands

Stefan E Roijers

Average Co-Inventor Count = 3.00

ph-index = 2

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 157

Stefan E Roijers ↔ Engbert B Nijhof (1 patent)Stefan E Roijers ↔ Marcel J Bucks (1 patent)Stefan E Roijers ↔ Johannes E Algra (1 patent)Stefan E Roijers ↔ Oscar J Deurloo (1 patent)Stefan E Roijers ↔ Pieter W Habing (1 patent)Stefan E Roijers ↔ John E De Clercq (1 patent)Stefan E RoijersStefan E Roijers (2 patents)Engbert B NijhofEngbert B Nijhof (8 patents)Marcel J BucksMarcel J Bucks (7 patents)Johannes E AlgraJohannes E Algra (5 patents)Oscar J DeurlooOscar J Deurloo (4 patents)Pieter W HabingPieter W Habing (1 patent)John E De ClercqJohn E De Clercq (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. U.S. Philips Corporation (2 from 14,087 patents)

2. Lumileds Lighting B.v. (1 from 3 patents)


2 patents:

1. 6147458 - Circuit arrangement and signalling light provided with the circuit

2. 5834902 - Discharge lamp igniting and operating curcuit having interference signal

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as of
12/17/2025
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