Inventor
David Krofchak
Inventor
Copper Cliff, CA
Overview
Patents· 17 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C22Bprimary
C22BProduction and refining of metals17%
Y02PClimate change mitigation technologies in the production or processing of goods17%
C04BLime, magnesia13%
Y02WClimate change mitigation technologies related to wastewater treatment or waste management13%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests10%
C21BManufacture of iron or steel7%
B03BSeparating solid materials using liquids or using pneumatic tables or jigs4%
C02FTreatment of water, waste water, sewage, or sludge4%
B03DFlotation3%
B09BDisposal of solid waste not otherwise provided for3%
PatentTitleYear
6,440,194'Recovery of precious metals from metal alloys produced aluminothermically from base metal smelter slag'20026,231,767'Treatment of phosphatic wastes'20016,033,467'Method of making cement or mine backfill from base metal smelter slag'20006,026,965'Process for recovering mineral particles, metal particles or small precious stones from an aqueous slim associated with an ore body or mineral deposit or processing thereof'20005,968,258'Method of making cement from base metal smelter slag'19995,893,463'Recovering precious metals and small precious stones from clay suspensions'19995,865,872'Method of recovering metals and producing a secondary slag from base metal smelter slag'19995,749,962'Method of making cement from base metal smelter slag'19985,626,646'Method of recovering metals and producing a secondary slag from base metal smelter slag'19975,593,493'Method of making concrete from base metal smelter slag'19975,573,576'Method of treating steel mill waste'19965,439,505'Treatment of steel mill waste for recycling'19954,279,635'Process for treating phosphatic clay suspensions'19814,229,295'Solidification of aqueous sludge'19804,216,012'Process for the treatment of incinerated sewage sludge ash'19804,110,212'Method of treating a waste liquid containing polluting compounds'19783,965,243'Recovery of sodium thiocyanate'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1978Based in Ontario, CA· patent location history
1978–1981Patents assigned to KROFCHAK DAVID (4)· patent assignee history
1980–1981Based in Markham, CA· patent location history
1995–1997Based in Oakville, CA· patent location history
1996Patents assigned to INT SOLIDIFICATION INC (1)· patent assignee history
1997–2002Patents assigned to FENICEM MINERALS INC (6)· patent assignee history
1998–2002Based in Copper Cliff, CA· patent location history
1999–2000Patents assigned to ATEBA MINES INC (2)· patent assignee history
2001Patents assigned to CLAYTECH ENVIROMENTAL SERVICES (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| FENICEM MINERALS INC | 6 | 1997–2002 |
| KROFCHAK DAVIDself | 4 | 1978–1981 |
| ATEBA MINES INC | 2 | 1999–2000 |
| CLAYTECH ENVIROMENTAL SERVICES | 1 | 2001 |
| INT SOLIDIFICATION INC | 1 | 1996 |
Locations
| Location | Patents | Span |
|---|---|---|
| Copper Cliff, CA | 8 | 1998–2002 |
| Oakville, CA | 4 | 1995–1997 |
| Markham, CA | 3 | 1980–1981 |
| Ontario, CA | 2 | 1976–1978 |