Inventor
Thomas C. Johnson
Inventor
Roseau, MN, US
Overview
16→
Patents
1989–2020
Patent span
General tagging of new technological developments
Primary field (CPC Y)
Patents· 16 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G01Fprimary
G01FMeasuring volume, volume flow, mass flow or liquid level19%
C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds13%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests9%
A61LMethods or apparatus for sterilising materials or objects in general6%
B01DSeparation6%
B65DContainers for storage or transport of articles or materials, e.g. bags, barrels, bottles, boxes, cans, cartons, crates, drums, jars, tanks, hoppers, forwarding containers6%
C02FTreatment of water, waste water, sewage, or sludge6%
E02BHydraulic engineering6%
Y02ATechnologies for adaptation to climate change6%
Y10TTechnical subjects covered by former us classification6%
PatentTitleYear
10,557,740Bin level indicator202010,408,659Bin level inicator2019D0848874Material level indicator actuator2019D0806899'Canister holder'2018D0740233'Activator shield'2015D0642231'Golfing ball line marker'20116,143,172'Methods for ameliorating hydrocarbon spills in marine and inland waters'20006,067,927'Visual indicator'20005,863,440'Methods for ameliorating oil spills in marine and inland waters'19995,629,377'Water absorbent resin particles of crosslinked carboxyl containing polymers and method of preparation'19975,416,160'Water-swellable polymers having improved color'19955,088,323'Actuator for visual indicator'19925,075,344'Process for producing a superabsorbent polymer'19914,833,222'Crosslinker stabilizer for preparing absorbent polymers'19894,829,820'Visual indicator'19894,799,383'Visual indicator'1989Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1989–1997Patents assigned to DOW CHEMICAL CO (4)· patent assignee history
1989–1992Patents assigned to LTJ ENTERPRISES INC (3)· patent assignee history
1989–2020Based in Roseau, MN, US· patent location history
1989–1997Based in Midland, MI, US· patent location history
1999–2000Patents assigned to ABTECH INDUSTRIES INC (2)· patent assignee history
1999–2000Based in Scottsdale, AZ, US· patent location history
2011Based in Melrose, FL, US· patent location history
2015–2020Patents assigned to JOHNSON THOMAS C (5)· patent assignee history
2018Based in Weare, NH, US· patent location history
2019–2020Patents assigned to LTJ ENTPR INC (3)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| JOHNSON THOMAS Cself | 5 | 2015–2020 |
| DOW CHEMICAL CO | 4 | 1989–1997 |
| LTJ ENTERPRISES INC | 3 | 1989–1992 |
| LTJ ENTPR INC | 3 | 2019–2020 |
| ABTECH INDUSTRIES INC | 2 | 1999–2000 |
Locations
| Location | Patents | Span |
|---|---|---|
| Roseau, Minnesota, US | 8 | 1989–2020 |
| Midland, MI, US | 4 | 1989–1997 |
| Scottsdale, AZ, US | 2 | 1999–2000 |
| Weare, NH, US | 1 | 2018 |
| Melrose, Florida, US | 1 | 2011 |