Inventor · disambiguated record
Helena L. Chum
Also filed as: CHUM HELENA L
17 granted patents·879 citations·filing 1983–1995
96Inventor score
Files withMIDWEST RESEARCH INST12US ENERGY2CHUM HELENA L1MIDWEST RESEARCH INST VENTURES1MRI VENTURES INC1
Top patents by PatentIndex Score
17 records- 0196US5504259AProcess to convert biomass and refuse derived fuel to ethers and/or alcoholsMIDWEST RESEARCH INST·Filed 1992·Granted Apr 2, 1996·238 cites·29 claims
- 0296US5216149AControlled catalytic and thermal sequential pyrolysis and hydrolysis of mixed polymer waste streams to sequentially recover monomers or other high value productsMIDWEST RESEARCH INST·Filed 1991·Granted Jun 1, 1993·69 cites·4 claims
- 0396US4942269AProcess for fractionating fast-pyrolysis oils, and products derived therefromMIDWEST RESEARCH INST·Filed 1988·Granted Jul 17, 1990·92 cites·31 claims
- 0495US5359061AControlled catalytic and thermal sequential pyrolysis and hydrolysis of polymer waste comprising nylon 6 and a polyolefin or mixtures of polyolefins to sequentially recover monomers or other high value productsMIDWEST RESEARCH INST·Filed 1992·Granted Oct 25, 1994·60 cites·7 claims
- 0595US4617090AProcess for producing peracids from aliphatic hydroxy carboxylic acidsUS ENERGY·Filed 1984·Granted Oct 14, 1986·78 cites·6 claims
- 0692US5321174AControlled catalystic and thermal sequential pyrolysis and hydrolysis of polycarbonate and plastic waste to recover monomersMIDWEST RESEARCH INST·Filed 1992·Granted Jun 14, 1994·44 cites·5 claims
- 0788US5300704AControlled catalytic and thermal sequential pyrolysis and hydrolysis of mixed polymer waste streams to sequentially recover monomers or other high value productsMIDWEST RESEARCH INST·Filed 1992·Granted Apr 5, 1994·34 cites·4 claims
- 0887US5821553APyrolysis and hydrolysis of mixed polymer waste comprising polyethyleneterephthalate and polyethylene to sequentially recoverMIDWEST RESEARCH INST·Filed 1994·Granted Oct 13, 1998·31 cites·6 claims
- 0982US5359099AControlled catalytic and thermal sequential pyrolysis and hydrolysis of mixed polymer waste streams to sequentially recover monomers or other high value productsMIDWEST RESEARCH INST·Filed 1992·Granted Oct 25, 1994·25 cites·8 claims
- 1082US5223601APhenolic compounds containing/neutral fractions extract and products derived therefrom from fractionated fast-pyrolysis oilsMIDWEST RESEARCH INST VENTURES·Filed 1991·Granted Jun 29, 1993·42 cites·116 claims
- 1182US4964995ASupercritical separation process for complex organic mixturesMIDWEST RESEARCH INST·Filed 1989·Granted Oct 23, 1990·56 cites·34 claims
- 1278US5464602ASequential pyrolysis of plastic to recover polystyrene HCL and terephthalic acidMIDWEST RESEARCH INST·Filed 1995·Granted Nov 7, 1995·28 cites·1 claims
- 1377US5235021AResole resin products derived from fractionated organic and aqueous condensates made by fast-pyrolysis of biomass materialsCHUM HELENA L·Filed 1991·Granted Aug 10, 1993·27 cites·94 claims
- 1474US5386070APyrolysis of polystyrene - polyphenylene oxide to recover styrene and useful productsMIDWEST RESEARCH INST·Filed 1992·Granted Jan 31, 1995·18 cites·8 claims
- 1566US5136111AControlled catalytic and thermal sequential pyrolysis and hydrolysis of phenolic resin containing waste streams to sequentially recover monomers and chemicalsMRI VENTURES INC·Filed 1991·Granted Aug 4, 1992·11 cites·25 claims
- 1657US5091499AProcess for preparing phenolic formaldehyde resole resin products derived from fractionated fast-pyrolysis oilsMIDWEST RESEARCH INST·Filed 1989·Granted Feb 25, 1992·9 cites·18 claims
- 1757US4476025ASeparation of certain carboxylic acids utilizing cation exchange membranesUS ENERGY·Filed 1983·Granted Oct 9, 1984·17 cites·19 claims
Join the waitlist — get patent alerts
Get an alert when Helena L. Chum files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →