Prototech Company
Records under this name other than patents Prototech Company holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 3,933,684 | Method of forming palladium oxide and palladium particles Term ended Term ended no later than Jan 20, 1996 · Low confidence | Term ended | Term ended no later than Jan 20, 1996 | Low confidence |
| US 3,992,331 | Catalytic platinum metal particles on a substrate and method of preparing the catalyst Term ended Term ended no later than Nov 16, 1996 · Low confidence | Term ended | Term ended no later than Nov 16, 1996 | Low confidence |
| US 3,992,512 | Finely particulated colloidal platinum compound and sol for producing the same, and method of preparation Term ended Term ended no later than Nov 16, 1996 · Low confidence | Term ended | Term ended no later than Nov 16, 1996 | Low confidence |
| US 4,044,193 | Finely particulated colloidal platinum compound and sol for producing the same, and method of preparation of fuel cell electrodes and the like employing the same Formerly held Term ended Term ended no later than Aug 23, 1997 · Low confidence | Term ended | Term ended no later than Aug 23, 1997 | Low confidence |
| US 4,059,541 | Platinum colloid sol and method of forming same 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 4,082,699 | Method of preparing catalytic structures from colloidal platinum compounds and such catalytic structures Term ended Term ended no later than Apr 4, 1998 · Low confidence | Term ended | Term ended no later than Apr 4, 1998 | Low confidence |
| US 4,102,819 | Finely particulated colloidal platinum, compound and sol for producing the same, and method of preparation Term ended Term ended no later than Jul 25, 1998 · Low confidence | Term ended | Term ended no later than Jul 25, 1998 | Low confidence |
| US 4,166,143 | Control of the interaction of novel platinum-on-carbon electrocatalysts with fluorinated hydrocarbon resins in the preparation of fuel cell electrodes Term ended Term ended no later than Aug 28, 1999 · Low confidence | Term ended | Term ended no later than Aug 28, 1999 | Low confidence |
| US 4,248,682 | Carbon-cloth-based electrocatalytic gas diffusion electrodes, assembly and electrochemical cells comprising the same Formerly held Term ended Term ended no later than Feb 3, 2001 · Low confidence | Term ended | Term ended no later than Feb 3, 2001 | Low confidence |
| US 4,293,396 | Thin carbon-cloth-based electrocatalytic gas diffusion electrodes, and electrochemical cells comprising the same Formerly held Term ended Term ended no later than Oct 6, 2001 · Low confidence | Term ended | Term ended no later than Oct 6, 2001 | Low confidence |