U.S. patent number D251,380 [Application Number 05/749,498] was granted by the patent office on 1979-03-20 for filter. Invention is credited to Jordi Casamitjana.
United States Patent | D251,380 |
Casamitjana | March 20, 1979 |
Inventors: | Casamitjana; Jordi (Lomas de Becerra, MX) |
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Appl. No.: | 05/749,498 |
Filed: | December 10, 1976 |
Current U.S. Class: | D23/209 |
Current International Class: | D2301 |
Field of Search: | ;D23/1-4 ;210/136,238,444,446-448 |
1705042 | March 1929 | Babitch |
2565696 | August 1951 | Ketelsen |
2647635 | August 1953 | Hove et al. |
2894606 | July 1959 | Veres |
3883428 | May 1975 | Waring |
3931011 | January 1976 | Richards |
4017397 | April 1977 | Copeland |
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