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USPTO Patent Rankings Data through Dec 31, 2025
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Daniel C. Duan — 28 Patents

3M: 24 patents #514 of 11,543Top 5%
Okabena, MN: #39 of 412 inventorsTop 10%
Minnesota: #2,190 of 52,454 inventorsTop 5%
Overall (All Time): #134,628 of 4,157,543Top 4%
28 Patents All Time
Daniel C. Duan has been granted 28 US patents while listed as an inventor at 3M. The first was granted in 1988 and the most recent in December 2025. Daniel C. Duan ranks #134,628 of 4,157,543 US inventors in our database (top 3.2%). Patent records list Daniel C. Duan in Okabena, MN, US.

Issued Patents All Time

Showing 1–25 of 28 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
12503688 Engineered transaminase polypeptides Jovana Nazor, Christopher Michael Micklitsch, Auric Anthony Sowell-Kantz, Steven T. Miller, Birgit Kosjek +2 more 2025-12-23
12480111 Penicillin-G acylases Rama Voladri, Christopher Michael Micklitsch, Oscar Alvizo, Jovana Nazor, Judy Victoria Antonio Viduya +8 more 2025-11-25
12473557 Engineered guanylate kinase variant enzymes Auric Anthony Sowell-Kantz, Aksiniya Lyubenova Petkova, Oscar Alvizo 2025-11-18
12460195 Engineered deoxyribose-phosphate aldolases Oscar Alvizo, Jovana Nazor, Harvinder Chagger Maniar, James Nicholas Riggins, Jonathan Vroom +8 more 2025-11-04
12409401 Pleated filtration assembly comprising spunbonded prefilter Himanshu Jasuja, Nathan E. Schultz, Seth M. Kirk, Bryan L. Gerhardt, Michael R. Berrigan 2025-09-09
9861580 Method of making a dry powder pharmaceutical composition Michael W. Mueting, Stephen W. Stein 2018-01-09 $42,794,000
8554317 Microneedle arrays and methods of use thereof 2013-10-08 $11,799,000
7846488 Masking method for coating a microneedle array Peter R. Johnson, Marla R. Emery, James T. Wolter, Jennifer E. Raeder-Devens, Moses M. David +1 more 2010-12-07 $19,108,000
7718162 Medicinal aerosol compositions with a functionalized polyethyleneglycol excipient James S. Stefely 2010-05-18 $20,886,000
7687054 Biocompatible compounds for sustained release pharmaceutical drug delivery systems James S. Stefely, David W. Schultz, Chester Leach 2010-03-30 $16,822,000
7186402 Medicinal aerosol compositions with an amide and/or ester containing excipient compound Robert A. Scherrer, James S. Stefely 2007-03-06 $21,529,000
7097853 Matrix for transdermal drug delivery James E. Garbe, Cheryl L. Moore, Jamieson C. Keister, Chan U. Ko 2006-08-29 $27,486,000
6902740 Pyrrolidonoethyl (meth)acrylate containing pressure sensitive adhesive compositions Mark S. Schaberg, Kaveh Pournoor 2005-06-07 $21,469,000
6482638 Heat-relaxable substrates and arrays Sanjay L. Patil, Kurt J. Halverson, Pierre H. LePere 2002-11-19 $15,700,000
6416742 Medicinal aerosol solution formulation with biocompatible polymer James S. Stefely, David W. Schultz, Luke E. Schallinger, Craig A. Perman, Chester Leach 2002-07-09 $16,809,000
6126919 Biocompatible compounds for pharmaceutical drug delivery systems James S. Stefely, David W. Schultz, Luke E. Schallinger, Craig A. Perman, Chester Leach 2000-10-03 $25,340,000
6042811 Aerosol formulation containing a diol-diacid derived dispersing aid James S. Stefely, David W. Schultz, Chester Leach 2000-03-28 $31,063,000
5725841 Aerosol formulation containing an ester-, amide-, or mercaptoester-derived dispersing aid James S. Stefely, David W. Schultz, Chester Leach 1998-03-10 $13,152,000
5670097 Method of making blood gas sensors overcoats using permeable polymeric compositions Mark S. Schaberg, Terence M. Fogarty, William Lee Howard, Jr., Kenneth B. Wood 1997-09-23 $9,976,000
5569450 Aerosol formulation containing an ester-, amide-, or mercaptoester-derived dispersing aid James S. Stefely, David W. Schultz, Chester Leach 1996-10-29 $32,097,000
5438988 Pressure-sensitive poly(N-vinyl lactam) adhesive composition and biomedical electrodes using same Robert A. Asmus, Timothy M. Dietz, Rosa Uy, Olester Benson, Jr. 1995-08-08 $6,496,000
5409966 Method for producing pressure sensitive poly (N-vinyl lactam) Robert A. Asmus, Timothy M. Dietz, Rosa Uy, Olester Benson, Jr. 1995-04-25 $6,803,000
5389376 Pressure-sensitive poly(n-vinyl lactam) adhesive composition and skin covering articles using same Robert A. Asmus, Timothy M. Dietz, Rosa Uy, Olester Benson, Jr. 1995-02-14 $6,976,000
5276079 Pressure-sensitive poly(n-vinyl lactam) adhesive composition and method for producing and using same Robert A. Asmus, Timothy M. Dietz, Rosa Uy, Olester Benson, Jr. 1994-01-04 $11,841,000
5225473 Pressure-sensitive adhesives 1993-07-06 $9,173,000