Grefco, Inc.
Records under this name other than patents Grefco, Inc. holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 3,952,830 | Mineral aggregate (perlite) acoustical board Term ended Term ended no later than Apr 27, 1996 · Low confidence | Term ended | Term ended no later than Apr 27, 1996 | Low confidence |
| US 3,958,373 | Twin membrane, self sealing, mechanically fastened insulated roof deck system Term ended Term ended no later than May 25, 1996 · Low confidence | Term ended | Term ended no later than May 25, 1996 | Low confidence |
| US 3,978,264 | Coating for porous surfaces Term ended Term ended no later than Aug 31, 1996 · Low confidence | Term ended | Term ended no later than Aug 31, 1996 | Low confidence |
| US 4,011,183 | Building board products and process for producing same Term ended Term ended no later than Mar 8, 1997 · Low confidence | Term ended | Term ended no later than Mar 8, 1997 | Low confidence |
| US 4,057,908 | Method and apparatus for drying damp powder Term ended Term ended no later than Nov 15, 1997 · Low confidence | Term ended | Term ended no later than Nov 15, 1997 | Low confidence |
| US 4,059,231 | Method and apparatus for selectively comminuting particles of a frangible material Term ended Term ended no later than Nov 22, 1997 · Low confidence | Term ended | Term ended no later than Nov 22, 1997 | Low confidence |
| US 4,059,933 | Strip for fastening and sealing sheets of construction material Term ended Term ended no later than Nov 29, 1997 · Low confidence | Term ended | Term ended no later than Nov 29, 1997 | Low confidence |
| US 4,063,395 | Twin membrane, self sealing, mechanically fastened insulated roof deck system Term ended Term ended no later than Dec 20, 1997 · Low confidence | Term ended | Term ended no later than Dec 20, 1997 | Low confidence |
| US 4,067,155 | Sealing system Term ended Term ended no later than Jan 10, 1998 · Low confidence | Term ended | Term ended no later than Jan 10, 1998 | Low confidence |
| US 4,071,993 | Construction material in sheet form and method of joining sheets edge-to-edge Term ended Term ended no later than Feb 7, 1998 · Low confidence | Term ended | Term ended no later than Feb 7, 1998 | Low confidence |