Robert Hehlen has been granted 6 US patents while listed as an inventor at Thomson-Csf . The first was granted in 1984 and the most recent in October 1991. Robert Hehlen ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list Robert Hehlen in Paris, FR.
Patents per Year Patents granted per year, 1984 to 1991 Bar chart with a peak of 2 patents in 1984. peak 2 1984: 2 patents 1984 1985: 1 patents 1985 1986: 1 patents 1986 1987: 1 patents 1987 1991: 1 patents 1991
Issued Patents All Time
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Showing 1–6 of 6 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
5055833 Method for the control of an electro-optical matrix screen and control circuit by Philippe Hehlen, legal representative , by Bernard Hehlen, legal representative , Maurice Le Galguen , Bruno Mourey 1991-10-08
4673256 Process for controlling a matrix access display device Michel Hareng , Serge Le Berre , Bruno Mourey 1987-06-16
$14,000
4621261 System for making a thermo-active device temperature dependent Philippe Marcenac 1986-11-04
$15,000
4525708 Thermoelectric effect display device Michel Hareng , Philippe Marcenac , Serge Le Berre , Pierre Leclerc , Jean-Noel Perbet 1985-06-25
4481510 Electrooptical switching device Michel Hareng , Serge LeBerre , Pierre Leclerc 1984-11-06
4427997 Control device for a display screen and display screen controlled by this device Michel Hareng , Serge Le Berre , Pierre Leclerc , Philippe Marcenac , Jean-Noel Perbet 1984-01-24