Frame member for constructing a duct
Description
The FIGURE is a perspective view of a frame member for constructing a duct showing our new design.
Referenced Cited
U.S. Patent Documents
Foreign Patent Documents
| 1919716 | July 1933 | Freeman |
| 2576296 | November 1951 | Green |
| 2667241 | January 1954 | Shannon |
| 3286405 | November 1966 | Schembri |
| 3854248 | December 1974 | Dayus |
| 4028856 | June 14, 1977 | Dalbec |
| 4553363 | November 19, 1985 | Weinar |
| 4598516 | July 8, 1986 | Groshong |
| 826866 | January 1952 | DEX |
Patent History
Patent number: D339641
Type: Grant
Filed: Jun 22, 1990
Date of Patent: Sep 21, 1993
Inventors: Stefan Leufstedt (S-271 44 Ystad), Carl-Eric Jaderberg (S-393 23 Kalmar)
Primary Examiner: A. Hugo Word
Assistant Examiner: Doris Clark
Law Firm: Merchant & Gould Smith, Edell, Welter & Schmidt
Application Number: 7/542,267
Type: Grant
Filed: Jun 22, 1990
Date of Patent: Sep 21, 1993
Inventors: Stefan Leufstedt (S-271 44 Ystad), Carl-Eric Jaderberg (S-393 23 Kalmar)
Primary Examiner: A. Hugo Word
Assistant Examiner: Doris Clark
Law Firm: Merchant & Gould Smith, Edell, Welter & Schmidt
Application Number: 7/542,267
Classifications
Current U.S. Class:
Extruded Shape (19) (D25/119)
