|   
		 
			 The ornamental design for an envelope power stacker, as shown.  | 
	|||||||||||||||||
FIG. 1 is an isometric view of the envelope power stacker showing my new design;
FIG. 2 is an end view thereof;
FIG. 3 is an end view thereof opposite the end view shown in FIG. 2;
FIG. 4 is a top plan view thereof;
FIG. 5 is a side elevational view thereof;
FIG. 6 is a side elevational view thereof opposite the side shown in FIG. 5 .
| Patent | Priority | Assignee | Title | 
| D299774, | Sep 05 1986 | Opex Corporation | Envelope conveyor/stacker | 
| D478121, | Jan 07 2002 | Opex Corporation | Envelope opener | 
| D974461, | Mar 19 2019 | Opex Corporation | Envelope opener | 
| Patent | Priority | Assignee | Title | 
| 193551, | 
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Jan 12 1977 | Omation Corporation | (assignment on the face of the patent) | / | 
| Date | Maintenance Fee Events | 
| Date | Maintenance Schedule |