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The ornamental design for a perpetual calendar, as shown and described. |
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FIG. 1 is a front elevational view of the perpetual calendar;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
| Patent | Priority | Assignee | Title |
| Patent | Priority | Assignee | Title |
| 2523206, | |||
| 3565246, | |||
| 373235, | |||
| 4176478, | Jul 12 1978 | Calendar | |
| 203725, | |||
| D258811, | Nov 28 1978 | Combined electronic clock and perpetual calendar | |
| D274535, | Jun 04 1981 | Modular calendar | |
| D363227, | Sep 27 1994 | Perpetual calender-clock | |
| D367496, | Apr 05 1994 | Magnetic perpetual calendar |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jan 29 1999 | COE, MATTHEW | PharmaDesign, Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 009641 | /0628 | |
| Feb 09 1999 | PharmaDesign Inc. | (assignment on the face of the patent) | / |
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