U.S. patent number D311,757 [Application Number 07/078,071] was granted by the patent office on 1990-10-30 for electrically-powered eraser. This patent grant is currently assigned to Rotex Company. Invention is credited to Mack W. Crutchfield.
United States Patent | D311,757 |
Crutchfield | October 30, 1990 |
Inventors: | Crutchfield; Mack W. (Dallas, TX) |
---|---|
Assignee: | Rotex Company (Dallas,
TX) |
Appl. No.: | 07/078,071 |
Filed: | July 27, 1987 |
Current U.S. Class: | D19/188; D19/65 |
Field of Search: | ;D8/61,62 ;D19/53 ;15/3.53 |
D180101 | April 1657 | Robinson |
D184831 | April 1959 | Palma |
D205748 | September 1966 | Hall |
D207147 | March 1967 | Daher |
D217705 | June 1970 | Niederwaugers |
D223969 | June 1972 | Collura |
D304543 | November 1989 | Somers et al. |
3286558 | November 1966 | Hufnagel |
Charles Bruning Company, see Cordless Electric Eraser, right side of page.. |
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