Headwall structure for drainage conduit
Description
The FIGURE shown is a front, side perspective view of a headwall structure for drainage conduit showing my new design.
Claims
The ornamental design for a headwall structure for drainage conduit, as shown and described.
Referenced Cited
U.S. Patent Documents
Other references
| D180410 | June 1957 | Mowbray |
| D277696 | February 19, 1985 | Doman et al. |
| D292934 | November 24, 1987 | Alberico |
| D379850 | June 10, 1997 | Nelson |
| 1620089 | March 1927 | Fischer |
| 2041267 | May 1936 | Schroeder |
| 3779021 | December 1973 | Green |
| 4723871 | February 9, 1988 | Roscoe |
| 4993872 | February 19, 1991 | Lockwood |
| 5836717 | November 17, 1998 | Bernini |
| 5971663 | October 26, 1999 | Brothers |
- Langley Concrete Group, Type II Headwall Structure, Specifications Drawing, Nov. 1998, 1 page, Victoria, Canada.
- Langley Concrete Group, 16-20 Headwall Structure, Specifications Drawing, Nov. 1998, 1 page, Victoria, Canada.
Patent History
Patent number: D447544
Type: Grant
Filed: Sep 7, 2000
Date of Patent: Sep 4, 2001
Inventor: Donald S. Quin (Victoria, B.C.)
Primary Examiner: Robin V. Taylor
Attorney, Agent or Law Firm: Klarquist Sparkman Campbell Leigh & Whinston, LLP
Application Number: 29/129,203
Type: Grant
Filed: Sep 7, 2000
Date of Patent: Sep 4, 2001
Inventor: Donald S. Quin (Victoria, B.C.)
Primary Examiner: Robin V. Taylor
Attorney, Agent or Law Firm: Klarquist Sparkman Campbell Leigh & Whinston, LLP
Application Number: 29/129,203
Classifications
