Hubertus Psaar has been granted 19 US patents while listed as an inventor at Bayer Healthcare . The first was granted in 1980 and the most recent in July 1992. Hubertus Psaar ranks #229,345 of 4,157,543 US inventors in our database (top 5.5%). Patent records list Hubertus Psaar in Leverkusen, DE.
Patents per Year Patents granted per year, 1980 to 1992 Bar chart with a peak of 6 patents in 1990. peak 6 1980: 2 patents 1980 1984: 1 patents 1984 1986: 1 patents 1986 1988: 1 patents 1988 1989: 4 patents 1989 1990: 6 patents 1990 1992: 4 patents 1992 Issued Patents All Time
Showing 1–19 of 19 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
5134113 Thermoreactive recording material Gunter Klug , Siegfried Korte 1992-07-28
5130442 Chromogenic enamine compounds, their preparation and use as color formers Karlheinrich Meisel 1992-07-14
5118814 Tetraindolyl-heptamethine derivatives Horst Berneth , Gunter Klug 1992-06-02
5094688 Triarylmethane color-forming agents Udo Eckstein , Gert Jabs 1992-03-10
4931567 Bis(indolyl)ethylene compounds Horst Berneth 1990-06-05
4923641 Highly concentrated stable solutions of color-forming agent: for pressure-sensitive recording materials Udo Eckstein 1990-05-08
4918048 Thermoreactive recording material Siegfried Korte 1990-04-17
4902806 Bis(indolyl)ethylene aldehydes — 1990-02-20
4897494 Bis(indolyl)ethylene process Horst Berneth 1990-01-30
4897223 Tri-phenyl methyl color-forming agents Udo Eckstein , Roderich Raue 1990-01-30
4869989 Dry toners containing fanal pigments based on cationic dyes Roderich Raue 1989-09-26
4849306 Dry toners containing methinefanal pigments Roderich Raue , Horst Berneth 1989-07-18
4847177 Fanal pigments of closed-ring dry toners containing indamine-and diphenylmethane dyestuffs Roderich Raue 1989-07-11
4808719 1H-imidazo[2,3-a]indol-2-ones as color-forming agents Roderich Raue 1989-02-28
4783196 Highly concentrated stable solutions of color-forming agents: for pressure-sensitive recording materials Udo Eckstein 1988-11-08
4600930 Recording material which reacts under the influence of heat, its preparation and the use of acid-modified polymers as acceptors in this recording material — 1986-07-15
4458009 Process for the production of color photographic images and photographic recording materials Edith Weyde , Wilhelm Saleck , Anita von Konig , Hans hlschlager 1984-07-03
4211436 Pressure-sensitive recording material Hans-Peter Kuhlthau , Roderich Raue 1980-07-08
$1,029,000
4201707 Methine dyestuffs containing a phenyl azo group — 1980-05-06
$2,291,000