Inventor
David William Johnson
Inventor
Washington, WV, US
Overview
Patents· 34 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 bonds22%
C07CAcyclic or carbocyclic compounds18%
B01JChemical or physical processes, e.g. catalysis or colloid chemistry14%
C02FTreatment of water, waste water, sewage, or sludge8%
C08JWorking-up5%
H04LTransmission of digital information, e.g. telegraphic communication4%
C08LCompositions of macromolecular compounds3%
LOC243%
A61MDevices for introducing media into, or onto, the body1%
A62CFire-fighting1%
PatentTitleYear
11,059,216System for digital fabrication of graded, hierarchical material structures2021D0889639Syringe2020D0878576Selectable valve with indicator202010,464,875Process for the production of ethylenically unsaturated carboxylic acids or esters20199,890,103'Process for the production of (meth)acrylic acid and derivatives and polymers produced therefrom'20189,821,130'Multi-diameter pediatric tracheal cuff'20179,816,115'Process for the production of methyl methacrylate'20179,755,845'Protocol independent multicast (PIM) snooping for a shortest path bridging multicast (SPBM) network'20179,480,867'Proportional dynamic ratio control for compressed air foam delivery'20169,216,938'Process for the production of (meth)acrylic acid and derivatives and polyers produced therefrom'20159,174,913'Process for the production of methacrylic acid and its derivatives and polymers produced therefrom'20159,175,686'Priming valve system for pre-priming centrifugal pump intakes'20158,940,924'Mixed oxide catalyst and a process for the production of ethylenically unsaturated carboxylic acids or esters'20158,933,179'Method of producing arcylic and methacrylic acid'20158,907,121'Methyl methacrylate purification process'20148,675,658'Using multiple IGMP queriers in a layer 2 network'20148,592,624'Production of ethylenically unsaturated acids or esters thereof'20138,329,813'Thermal reduction of fluoroether carboxylic acids or salts from fluoropolymer dispersions'20128,329,782'Removing fluorosurfactant from aqueous fluoropolymer dispersions using anion exchange polymer with functional groups resistant to degradation to trialkylamines'20128,227,526'Removing fluorosurfactant from aqueous fluoropolymer dispersions using anion exchange polymer with functional groups resistant to degradation to trialkyl amines'20127,803,277'Process for removing fluorosurfactant from an aqueous fluoropolymer dispersion using sorbent pouches'20107,790,041'Removing fluorosurfactant from aqueous fluoropolymer dispersions'20107,671,111'Monitoring column breakthrough in a process for removing fluorosurfactant from aqueous fluoropolymer dispersions'20107,666,927'Removing fluorosurfactant from aqueous fluoropolymer dispersions using anion exchange polymer with functional groups resistant to degradation to trialkylamines'20107,666,928'Staged addition of non-fluorinated anionic surfactant to reduced fluorosurfactant fluoropolymer dispersion'20107,666,929'Process for reducing fluorosurfactant content of fluropolymer dispersions using anionic surfactant-treated anion exchange resin'20107,619,018'Process for removing fluorosurfactant from aqueous fluoropolymer dispersions and reducing scum formation'20097,612,139'Core/shell fluoropolymer dispersions with low fluorosurfactant content'20097,542,428'Geographical network alarm viewer'20097,053,147'Production of unsaturated acids or esters thereof'20066,984,668'Metal-compound catalyzed processes'20066,544,924'Catalysts for the production of unsaturated acids or esters'20035,816,789'Rotary pump/engine'19985,777,182'Cobalt-catalyzed process for preparing 1,3-propanidiol'1998Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
2003–2019Patents assigned to LUCITE INT UK LTD (12)· patent assignee history
2009–2012Patents assigned to DU PONT (11)· patent assignee history
2009–2012Based in Washington, WV, US· patent location history
2012–2015Patents assigned to JOHNSON DAVID WILLIAM (10)· patent assignee history
2013–2019Based in Redcar, GB· patent location history
2014–2017Based in North Andover, MA, US· patent location history
2015Patents assigned to EASTHAM GRAHAM RONALD (3)· patent assignee history
2015Patents assigned to HUDDLE THOMAS ANDREW (3)· patent assignee history
2015–2018Based in Durham, GB· patent location history
2020Based in South Jordan, UT, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| LUCITE INT UK LTD | 12 | 2003–2019 |
| DU PONT | 11 | 2009–2012 |
| JOHNSON DAVID WILLIAMself | 10 | 2012–2015 |
| EASTHAM GRAHAM RONALD | 3 | 2015 |
| HUDDLE THOMAS ANDREW | 3 | 2015 |
Locations
| Location | Patents | Span |
|---|---|---|
| Washington, WV, US | 11 | 2009–2012 |
| Redcar, GB | 6 | 2013–2019 |
| South Jordan, UT, US | 2 | 2020 |
| Durham, GB | 2 | 2015–2018 |
| North Andover, Massachusetts, US | 2 | 2014–2017 |