Inventor
Friedrich Engelhardt
Inventor
Frankfurt am Main, DE
Overview
Patents· 59 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C08Fprimary
C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds24%
C09KMaterials for miscellaneous applications, not provided for elsewhere12%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests12%
A61LMethods or apparatus for sterilising materials or objects in general8%
D06PDyeing or printing textiles6%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds6%
A61KPreparations for medical, dental or toiletry purposes3%
A61QSpecific use of cosmetics or similar toiletry preparations3%
Y10TTechnical subjects covered by former us classification3%
C04BLime, magnesia2%
PatentTitleYear
8,962,715'Stabilized aqueous polymer compositions and their use'20158,552,071'Hydrogels absorbing aqueous fluids'20137,842,741'Stabilized aqueous polymer compositions'20107,662,460'Plasticized superabsorbent polymer sheets and use thereof in hygienic articles'20107,132,479'Polymer mixtures with improved odor control'20066,602,950'Hydrophilic hydrogels with a high swelling capacity and method for producing and using them'20036,414,214'Mechanically stable hydrogel-forming polymers'20026,300,423'Process for modifying hydrophilic polymers'20015,489,647'Hydrophilic, swellable graft polymers'19965,331,059'Hydrophilic, highly swellable hydrogels'19945,236,965'Hydrophilic, swellable polymers'19935,214,075'Hydrophilic, swellable polymers'19935,182,312'Hydrophilic, swellable polymers'19935,082,059'Use of hydrocarbon-rich gels as fracturing fluids'19925,068,298'Alkenyl-phosphonic and -phosphinic esters, process for their preparation, their use and hydrogels prepared using them'19915,066,745'Alkenylphosphonic and --phosphinic acid esters, process for their preparation, hydrogels produced using them, and their use'19915,041,496'Hydrophilic, swellable graft copolymers, their preparation and use'19915,011,892'Hydrophilic swellable graft copolymers, their preparation and use'19914,959,441'Alkenylphosphonic and -phosphinic acid esters, process for their preparation, hydrogels produced using them, and their use'19904,931,497'Hydrophilic swellable graft polymers from maleic anhydride-alkylene substrate'19904,794,166'Process for the preparation of a hydrogel which is largely free from monomers'19884,749,758'Process for the preparation of copolymers of vinylphosphonic acid and (meth) acrylic acid in aqueous solution'19884,743,666'Water-soluble copolymers with pendant phosphonic, sulphonic and amide groups'19884,736,014'Water-soluble polycoesters, process for their preparation, and their use'19884,722,958'Process for the preparation of copolymers'19884,696,987'Process for the preparation of polymers of vinylphosphonic acid in protic solvents'19874,686,243'Copolymer, a process for its preparation and its use as enzyme supports'19874,587,283'Cement slurries for deep holes, with a copolymer content for reducing the water loss'19864,585,845'Phosphonic acid cross-linked hydrophilic copolymers'19864,551,513'Water soluble copolymers'19854,521,579'High molecular weight water-soluble polymers useful in deoiling sand and rock masses'19854,518,745'Metal chelates of water soluble copolymers'19854,507,440'Cross-linkable and cross linked macromolecular compositions wherein cross-linking is by structural bridges of the formula --NR.sup.x --CH.dbd.N--CO-- and their preparation'19854,500,437'Water soluble copolymers for use in fracture-acidizing of wells'19854,499,232'Water soluble, crosslinkable polymer compositions, their preparation and use'19854,471,097'Water soluble copolymers containing vinyl imidazole as drilling fluid additives'19844,463,165'Water-dispersible polyester, its preparation, and its use as a hydrophiling agent'19844,451,631'Agent and method for deoiling sand and rock masses'19844,407,321'Drag reducing agents'19834,401,836'Modified polyvinyl alcohol and its use as a sizing agent'19834,378,446'Acrylate-modified melamine resin which is stable on storage, its preparation and its use'19834,357,245'Water-soluble copolymer and its preparation'19824,323,363'Dyeing of mixed fibers'19824,320,060'Process for the preparation of derivatives of 3-(4-hydroxy-anilino)carbazole'19824,314,052'Polyester which is soluble or dispersible in water, a process for its preparation and its use as a levelling auxiliary, levelling auxiliaries and processes for uniform dyeing'19824,309,523'Water-soluble copolymer of acrylamidomethylpropanesulfonic acids salts'19824,304,569'Formulation for brightening synthetic fibers and its preparation and use'19814,300,903'Padding auxiliaries and processes for dyeing cellulose fibers or mixtures of cellulose fibers and synthetic fibers with sulphur dyestuffs, sulphur vat dyestuffs, vat dyestuffs and reactive dyestuffs'19814,252,532'Process for dyeing evenly synthetic fibrous materials'19814,250,296'Levelling agent and process for the even dyeing of materials made of synthetic fibers'19814,237,243'Use of cross-linked polymers to increase the viscosity in cosmetic, pharmaceutical and technical compositions'19804,237,249'Process for the preparation of crosslinked copolymers, the process products obtained, and their use in textile printing'19804,167,395'Water-soluble branched polyesters'19794,150,216'Hair-treating agents from branched, sulfo-group containing copolyesters'19794,101,274'Process for the level dyeing of synthetic fiber materials'19784,048,077'Aqueous clay base mud for deep drilling'19773,966,689'Polymers based on N-formyl-N\'-acryloyl-methylenediamines'19763,966,829'Method of purifying monoalcohols'19763,966,769'Sulfonyl compounds'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1996Patents assigned to CASSELLA FARBWERKE MAINKUR AG (34)· patent assignee history
1976–2015Based in Frankfurt am Main, DE· patent location history
1976Based in Hamburg, DE· patent location history
1977–1988Patents assigned to HOECHST AG (11)· patent assignee history
1981–2001Patents assigned to CASSELLA AG (5)· patent assignee history
1984Based in Frakfurt am Main-Fechenheim, DT· patent location history
1985Patents assigned to DRESSER IND (4)· patent assignee history
2002–2010Patents assigned to BASF AG (4)· patent assignee history
2003Based in Chesapeake, VA, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| CASSELLA FARBWERKE MAINKUR AG | 34 | 1976–1996 |
| HOECHST AG | 11 | 1977–1988 |
| CASSELLA AG | 5 | 1981–2001 |
| BASF AG | 4 | 2002–2010 |
| DRESSER IND | 4 | 1985 |
Locations
| Location | Patents | Span |
|---|---|---|
| Frankfurt am Main, DE | 56 | 1976–2015 |
| Chesapeake, Virginia, US | 1 | 2003 |
| Frakfurt am Main-Fechenheim, DT | 1 | 1984 |
| Hamburg, DE | 1 | 1976 |