Inventor · disambiguated record
John C. H. Chang
Also filed as: CHANG JOHN · CHANG JOHN C · CHANG JOHN C C · CHANG JOHN C H
51 granted patents·5 pending applications·1,794 citations·filing 1978–2022
99Inventor score
Files withWALLACE COMPUTER SERVICES21MINNESOTA MINING & MFG133M INNOVATIVE PROPERTIES CO6UNIV TEXAS5UNIV ARIZONA STATE2
Top patents by PatentIndex Score
56 records- 0198US4668406AFluorochemical biuret compositions and fibrous substrates treated therewithMINNESOTA MINING & MFG·Filed 1984·Granted May 26, 1987·104 cites·5 claims
- 0295US4822373AProcess for providing polyamide materials with stain resistance with sulfonated novolak resin and polymethacrylic acdMINNESOTA MINING & MFG·Filed 1988·Granted Apr 18, 1989·138 cites·16 claims
- 0393US4937123AProcess for providing polyamide materials with stain resistanceMINNESOTA MINING & MFG·Filed 1990·Granted Jun 26, 1990·120 cites·8 claims
- 0493US4426476ATextile treatmentsMINNESOTA MINING & MFG·Filed 1982·Granted Jan 17, 1984·49 cites·14 claims
- 0593US4425386AMulti-sheet assembly using autogenous coatingWALLACE COMPUTER SERVICES·Filed 1982·Granted Jan 10, 1984·48 cites·20 claims
- 0692US6802870B2Method for imparting soil and stain resistance to carpet3M INNOVATIVE PROPERTIES CO·Filed 2003·Granted Oct 12, 2004·40 cites·20 claims
- 0792US5644352AMulticolor heat-sensitive verification and highlighting systemWALLACE COMPUTER SERVICES·Filed 1996·Granted Jul 1, 1997·71 cites·18 claims
- 0892US5618063AMulticolor heat-sensitive verification and highlighting systemWALLACE COMPUTER SERVICES·Filed 1995·Granted Apr 8, 1997·73 cites·28 claims
- 0991US4875901ATreating fibrous polyamide articlesMINNESOTA MINING & MFG·Filed 1989·Granted Oct 24, 1989·65 cites·19 claims
- 1089US4540497AFluoroaliphatic radical-containing, substituted guanidines and fibrous substrates treated therewithMINNESOTA MINING & MFG·Filed 1982·Granted Sep 10, 1985·74 cites·17 claims
- 1187US6723438B2Soil resistant curable laminate coating3M INNOVATIVE PROPERTIES CO·Filed 2002·Granted Apr 20, 2004·36 cites·14 claims
- 1286US5427415AHeat sensitive system and use thereofWALLACE COMPUTER SERVICES·Filed 1992·Granted Jun 27, 1995·81 cites·39 claims
- 1385US5612541AUltraviolet radiation monitoring device and use thereofWALLACE COMPUTER SERVICES·Filed 1995·Granted Mar 18, 1997·71 cites·32 claims
- 1485US4511641AMetal film imaging structureMINNESOTA MINING & MFG·Filed 1983·Granted Apr 16, 1985·40 cites·20 claims
- 1584US5401481AProcesses for removing acid components from gas streamsUNIV TEXAS·Filed 1993·Granted Mar 28, 1995·46 cites·5 claims
- 1682US6468587B2Treatment of fibrous substrates with acidic silsesquioxanes emulsions3M INNOVATIVE PROPERTIES CO·Filed 2001·Granted Oct 22, 2002·17 cites·13 claims
- 1781US6060428AHeat-sensitive chromogenic systemWALLACE COMPUTER SERVICES·Filed 1998·Granted May 9, 2000·52 cites·25 claims
- 1879US4448445APressure-sensitive record systemWALLACE COMPUTER SERVICES·Filed 1982·Granted May 15, 1984·35 cites·10 claims
- 1978US4317743AProcess for making microcapsules and resulting productWALLACE BUSINESS FORMS INC·Filed 1979·Granted Mar 2, 1982·25 cites·17 claims
- 2077US6736857B2Method for imparting soil and stain resistance to carpet3M INNOVATIVE PROPERTIES CO·Filed 2001·Granted May 18, 2004·15 cites·52 claims
- 2177US5492599ATreated substrate having improved release propertiesMINNESOTA MINING & MFG·Filed 1994·Granted Feb 20, 1996·37 cites·16 claims
- 2277US4846502ATamper evident document and use thereofWALLACE COMPUTER SERVICES·Filed 1986·Granted Jul 11, 1989·45 cites·21 claims
- 2376US5431452AHidden entry system and image-developing device thereforWALLACE COMPUTER SERVICES·Filed 1993·Granted Jul 11, 1995·33 cites·24 claims
- 2474US5756181ARepellent and soil resistant carpet treated with ammonium polycarboxylate saltsMINNESOTA MINING & MFG·Filed 1996·Granted May 26, 1998·23 cites·14 claims
- 2572US4565641ABlend of fluorochemical guanidines and poly(oxyalkylenes)MINNESOTA MINING & MFG·Filed 1984·Granted Jan 21, 1986·13 cites·20 claims
- 2671US4748267AFluorochemical biuret compounds and fibrous substrates treated therewithMINNESOTA MINING & MFG·Filed 1987·Granted May 31, 1988·22 cites·15 claims
- 2770US5605873APressure-sensitive verification system and use thereofWALLACE COMPUTER SERVICES·Filed 1994·Granted Feb 25, 1997·13 cites·25 claims
- 2869US5970875APressure-sensitive tamper evident systemWALLACE COMPUTER SERVICES·Filed 1997·Granted Oct 26, 1999·20 cites·22 claims
- 2969US5744201AMethod for treating carpet using PH adjustmentMINNESOTA MINING & MFG·Filed 1997·Granted Apr 28, 1998·22 cites·22 claims
- 3069US5344191AHidden entry system and use thereofWALLACE COMPUTER SERVICES·Filed 1992·Granted Sep 6, 1994·30 cites·31 claims
- 3169US5098774ADivalent metal salts of sulfonated novolak resins and methods for treating fibrous polyamide materials therewithCHANG JOHN C·Filed 1990·Granted Mar 24, 1992·26 cites·14 claims
- 3267US6074436ACarpet treatment composition comprising polycarboxylate salts3M INNOVATIVE PROPERTIES CO·Filed 1998·Granted Jun 13, 2000·17 cites·57 claims
- 3364US5395138ASecurity document verification system with pressure-rupturable microcapsulesWALLACE COMPUTER SERVICES·Filed 1993·Granted Mar 7, 1995·21 cites·29 claims
- 3463US5898017AMulticolor chromogenic system having improved image qualityWALLACE COMPUTER SERVICES·Filed 1997·Granted Apr 27, 1999·15 cites·30 claims
- 3562US5738687AMethod for treating carpets with polycarboxylate salts to enhance soil resistance and repellencyMINNESOTA MINING & MFG·Filed 1996·Granted Apr 14, 1998·17 cites·34 claims
- 3662US5202103ARemoval of sulfur dioxide from gas streamsUNION CARBIDE CHEM PLASTIC·Filed 1991·Granted Apr 13, 1993·15 cites·20 claims
- 3762US2022018826A1Colorimetric plasmonic nanosensor for dosimetry of therapeutic levels of ionizing radiationUNIV ARIZONA STATE·Filed 2021·Application pending·0 cites
- 3861US5545459ABusiness forms having dual-functional coatingWALLACE COMPUTER SERVICES·Filed 1995·Granted Aug 13, 1996·12 cites·25 claims
- 3961US5100643AProcesses for removing acid components from gas streamsUNIV TEXAS·Filed 1988·Granted Mar 31, 1992·23 cites·33 claims
- 4061US5047222AProcess for removing sulfur from sulfur-containing gases: high calcium fly-ashUNIV TEXAS·Filed 1989·Granted Sep 10, 1991·13 cites·18 claims
- 4160US6162485AFingerprinting system and methodWALLACE COMPUTERS SERVICES INC·Filed 1998·Granted Dec 19, 2000·29 cites·12 claims
- 4260US5595955AVerification method using pressure and heat-sensitive chromogenic systemWALLACE COMPUTER SERVICES·Filed 1994·Granted Jan 21, 1997·23 cites·35 claims
- 4360US5270015AApparatus for removing sulfur from sulfur containing gasesUNIV TEXAS·Filed 1991·Granted Dec 14, 1993·24 cites·30 claims
- 4459US5401060ADocument with heat and pressure sensitive chromogentic composition thereonWALLACE COMPUTER SERVICES·Filed 1993·Granted Mar 28, 1995·22 cites·30 claims
- 4553US5536046AHeat sensitive system and use thereofWALLACE COMPUTER SERVICES·Filed 1995·Granted Jul 16, 1996·14 cites·33 claims
- 4650US2017212037A1Colorimetric plasmonic nanosensor for dosimetry of therapeutic levels of ionizing radiationUNIV ARIZONA STATE·Filed 2017·Application pending·0 cites
- 4748US5484169AHidden entry system and image-developing device thereforWALLACE COMPUTER SERVICES·Filed 1995·Granted Jan 16, 1996·12 cites·10 claims
- 4848US5047221AProcesses for removing sulfur from sulfur-containing gasesUNIV TEXAS·Filed 1990·Granted Sep 10, 1991·15 cites·18 claims
- 4947US6235128B1Carbon and alloy steels thermochemical treatmentsFiled 1999·Granted May 22, 2001·16 cites·15 claims
- 5046US2024334043A1Aided system of photography compositionGOOGLE LLC·Filed 2022·Application pending·0 cites
Showing the top 50 of 56 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when John C. H. Chang 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 →