Ringsdorf; Helmut

Patent Applications and Registrations

Patent applications and USPTO patent grants for Ringsdorf; Helmut.The latest application filed is for "use of organic compounds in the plastic columnar discotic liquid-crystal phase for transport of electric charges".

Company Profile

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Ringsdorf; Helmut - Mainz DE
Ringsdorf; Helmut - Mainz-gonsenheim DE

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Use of organic compounds in the plastic columnar discotic liquid-crystal phase for transport of electric charges Grant 6,099,750 - Simmerer , et al. August 8, 2	2000-08-08
Process for producing a surface coated with amino groups Grant 5,932,296 - Sluka , et al. August 3, 1	1999-08-03
Film comprising at least one unimolecular layer Grant 5,034,277 - Laschewsky , et al. July 23, 1	1991-07-23
Film comprising unimolecular layers Grant 4,970,120 - Laschewsky , et al. November 13, 1	1990-11-13
Process for the production of hyperfiltration membranes Grant 4,873,033 - Heckmann , et al. October 10, 1	1989-10-10
Hyperfiltration membranes having separation layers of monomolecular films of surfactants Grant 4,758,342 - Heckmann , et al. July 19, 1	1988-07-19
Optical recording medium Grant 4,702,945 - Etzbach , et al. October 27, 1	1987-10-27
Polymers containing mesogenic groups and dye radicals in the side chains Grant 4,631,328 - Ringsdorf , et al. December 23, 1	1986-12-23
Liquid-crystalline polymer phase having a cholesteric structure, processes for its preparation and its use Grant 4,293,435 - Portugall , et al. October 6, 1	1981-10-06

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