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US Patent: 5,662X
River dams for the easy passage of fish
River dams for the easy passage up and down of fish and of vessels
Patrick M'grath - Philadelphia, PA

USPTO Classifications:

Tool Categories:
water distribution systems : dams and weirs


Not known to have been produced


Patent Dates:
Granted: Oct. 10, 1829

Patent Pictures:
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Only about 2000 of the almost 10000 X-patent documents were recovered.

Because of the Patent Office fire in Dec. 1836, little is known about this patent. There are no patent drawings available. This patent is in the database for reference only.

For an improvement in River Dams, for the easy passage up and down of fish, and of vessels; Patrick M'Grath, Philadelphia, Pennsylvania, October 10.

"If we understand the description of this improved mode of forming dams, it consists in making the dam on the descending side, in the form of a plane but little inclined to the horizon, so that the water in passing down shall run with but little velocity. The claim is to " an easier communication between rivers and dams, for fish, vessels, &c."

Description from the Journal of the Franklin Institute, V5 1830 pg. 23.

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