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US Patent: 56,671
Improvement in pumps Double acting pump
Patentee: Joseph W. Douglas (exact or similar names) - Middletown, CT USPTO Classifications: 417/526 Tool Categories: household : water and plumbing : household hand pumps Assignees: W. & B. Douglas - Middletown, CT Manufacturer: W. & B. Douglas - Middletown, CT Witnesses: Ira Gardiner John M. Douglas	Patent Dates: Granted: Jul. 24, 1866 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for W. & B. Douglas
Description: The improvement is a double-acting pump with only one side pipe, which is achieved by using a hollow piston-rod for the other pipe.

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