Inventor
Dennis J. Helfritch
Inventor
Baltimore, MD, US
Overview
Patents· 12 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
B01Dprimary
B01DSeparation18%
B03CMagnetic or electrostatic separation of solid materials from solid materials or fluids15%
B01JChemical or physical processes, e.g. catalysis or colloid chemistry12%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests9%
A61LMethods or apparatus for sterilising materials or objects in general6%
Y02PClimate change mitigation technologies in the production or processing of goods6%
A62DChemical means for extinguishing fires or for combating or protecting against harmful chemical agents3%
B05BSpraying apparatus3%
B09CReclamation of contaminated soil3%
C01CAmmonia3%
PatentTitleYear
10,441,962Cold spray device and system20196,245,132'Air filter with combined enhanced collection efficiency and surface sterilization'20016,245,126'Method for enhancing collection efficiency and providing surface sterilization of an air filter'20015,785,932'Catalytic reactor for oxidizing mercury vapor'19985,695,616'Electron beam flue gas scrubbing treatment'19975,213,780'Method for nitrogen oxide reduction and flue gas reheating'19934,985,219'Removal of nitrogen oxides from waste gases'19914,960,445'Process for removing SO.sub.2 and fly ash from flue gas'19904,883,570'Apparatus and method for enhanced chemical processing in high pressure and atmospheric plasmas produced by high frequency electromagnetic waves'19894,832,806'Radiation for the selective destruction of toxic molecules on solid surfaces'19894,357,151'Electrostatically augmented cartridge type dust collector and method'19824,147,522'Electrostatic dust collector'1979Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1979–1982Patents assigned to AMERICAN PRECISION IND (2)· patent assignee history
1982Based in Charlotte, NC, US· patent location history
1989–1993Patents assigned to COTTRELL RES INC (5)· patent assignee history
1989–1993Based in Flemington, NJ, US· patent location history
1989Based in Somerville, NJ, US· patent location history
1997Patents assigned to RES COTRELLA COMPANIES INC (1)· patent assignee history
1997–2001Based in Baltimore, MD, US· patent location history
1998–2001Patents assigned to ENVIRONMENTAL ELEMENTS CORP (3)· patent assignee history
2019Patents assigned to GOVERNMENT OF THE US SECRETARY OF THE ARMY (1)· patent assignee history
2019Based in Rapid City, SD, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| COTTRELL RES INC | 5 | 1989–1993 |
| ENVIRONMENTAL ELEMENTS CORP | 3 | 1998–2001 |
| AMERICAN PRECISION IND | 2 | 1979–1982 |
| GOVERNMENT OF THE US SECRETARY OF THE ARMY | 1 | 2019 |
| RES COTRELLA COMPANIES INC | 1 | 1997 |
Locations
| Location | Patents | Span |
|---|---|---|
| Baltimore, Maryland, US | 4 | 1997–2001 |
| Flemington, New Jersey, US | 4 | 1989–1993 |
| Rapid City, SD, US | 1 | 2019 |
| Somerville, New Jersey, US | 1 | 1989 |
| Charlotte, NC, US | 1 | 1982 |