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Patent
   D447544
Priority
Mar 20 2000
Filed
Sep 07 2000
Issued
Sep 04 2001
Expiry
Sep 04 2015
Inventors
Quin, Dona…
Assg.orig
CIF COMPOS…
Assg.curr
CIF COMPOS…
Entity
unknown
Referenced by
14
References
11
Maint.:
n/a
The ornamental design for a headwall structure for drainage conduit, as shown and described.

The FIGURE shown is a front, side perspective view of a headwall structure for drainage conduit showing my new design.
INVENTORS:

Quin, Donald S.

THIS PATENT IS REFERENCED BY THESE PATENTS:
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6736570, Apr 16 2002 L&R Pre-Cast Concrete Works Precast safety end and form therefor
6769662, Apr 16 2002 L & R Pre-Cast Concrete Works Form and method for casting a monolithic precast safety end
D469519, Apr 16 2002 L&R PreCast Concrete Works; L&R Pre-Cast Concrete Works Safety end for a culvert
D735304, Mar 28 2013 STRATO TECHNOLOGY SOLUTIONS, LLC Low profile steam fitting
D761397, Apr 08 2015 GUTTERWORKS MFG INC Universal downspout adapter
D773018, Apr 13 2015 XYLEM WATER SOLUTIONS ZELIENOPLE LLC Wall adaptor for filter underdrain
D776796, Apr 08 2015 GUTTERWORKS MFG INC Universal downspout adapter
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ER6890,
ER8793,
THIS PATENT REFERENCES THESE PATENTS:
Patent Priority Assignee Title
1620089,
2041267,
3779021,
4723871, May 11 1987 Inexpensive headwall for culverts
4993872, Dec 28 1983 BT CS ACQUISTION CORP ; CONTECH ARCH TECHNOLOGIES, INC Precast concrete culvert system
5836717, Feb 25 1997 CONTECH ENGINEERED SOLUTIONS LLC Multi-segment spandrel wall for overfilled arch structures
5971663, Jul 10 1997 Culvert collar
180410,
D277696, Sep 28 1982 Kohler Co. Combined overflow hood and drain control
D292934, Mar 21 1985 Irrigation water drainage unit
D379850, May 02 1995 Irrigation water drainage unit
ASSIGNMENT RECORDS    Assignment records on the USPTO
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Dec 03 2003QUIN, DONALD S CIF COMPOSITES INC ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0147700200 pdf
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