Inventor
Friedhelm Muller
Inventor
Odenthal, DE
Overview
Patents· 30 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
D21Hprimary
D21HPulp compositions32%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds18%
C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds11%
G01NInvestigating or analysing materials by determining their chemical or physical properties8%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests8%
C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments5%
C08JWorking-up3%
B29BPreparation or pretreatment of the material to be shaped2%
C01GCompounds containing metals not covered by subclasses c01d or c01f2%
C01PIndexing scheme relating to structural and physical aspects of solid inorganic compounds2%
PatentTitleYear
7,544,233'Gas chromatograph with a mass spectrometer situated down therefrom, and method for performing the gas chromatographic/mass spectrometric analysis of a substance mixture'20096,454,840'Separation-column unit for a gas-chromatograph and method for making the same'20025,379,629'Method and apparatus for regulating the carrier gas pressure for separation column arrangements in gas chromatography'19955,166,076'Device and method for sample dosing in gas chromatography'19924,888,128'Paper-coating slips containing fluorescent brighteners'19894,877,328'Internal mixer'19894,481,319'Low-foam surface sizing agents for paper which contain copolymeric _maleic anhydride semi-amides'19844,478,681'Forgery-proof paper'19844,418,175'Cationic sizing agents for paper'19834,385,000'Surface-active phosphonic acid esters'19834,384,110'Polyamines containing urea groups prepared from lactam or aminocarboxylic acid'19834,348,514'Polyamines containing urea groups'19824,333,874'Cationic triazinylamino azo dyestuffs'19824,319,019'Polyamines containing amide groups'19824,282,000'Dyestuff solutions, their preparation and their use for dyeing paper'19814,254,255'Aqueous reaction of polyamine with alkylene dihalide in presence of emulsifier'19814,250,112'Polyalkylenepolyamines containing quaternary dialkylammonium groups'19814,250,299'Polyamines containing amide groups'19814,250,298'Polyamines containing amide groups'19814,198,203'Dyestuff solutions of copper phthalocyanine derivatives for paper dyeing'19804,173,485'Production of zinc and alkaline earth metal titanates'19794,166,002'Polyamines containing acid groups that are useful in papermaking'19794,152,312'Paper-sizing agents'19794,151,336'Process for the production of a substantially equimolecular copolymer of maleic acid anhydride and diisobutylene'19794,124,358'Sample-injection device for process gas chromatography with capillary columns'19784,113,506'Emulsions of resinic acid isocyanates as sizing agents for paper'19784,048,422'Production of copolymer powders from maleic anhydride and 1-olefins'19774,029,622'Non-aqueous polymer dispersions of water-soluble monomers'19774,001,193'Anionic sizes'19773,932,363'Polyamines containing acid groups'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1989Patents assigned to BAYER AG (24)· patent assignee history
1976–1989Based in Odenthal, DE· patent location history
1977Based in Bergisch Gladbach, DE· patent location history
1978–2002Patents assigned to SIEMENS AG (4)· patent assignee history
1978–2009Based in Linkenheim-Hochstetten, DE· patent location history
1989Patents assigned to CONTINENTAL AG (1)· patent assignee history
1989Based in Freudenberg, DE· patent location history
2009Patents assigned to SIEMENS AKTIENGESELLSACHAFT (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| BAYER AG | 24 | 1976–1989 |
| SIEMENS AG | 4 | 1978–2002 |
| CONTINENTAL AG | 1 | 1989 |
| SIEMENS AKTIENGESELLSACHAFT | 1 | 2009 |
Locations
| Location | Patents | Span |
|---|---|---|
| Odenthal, DE | 23 | 1976–1989 |
| Linkenheim-Hochstetten, DE | 5 | 1978–2009 |
| Freudenberg, DE | 1 | 1989 |
| Bergisch Gladbach, DE | 1 | 1977 |