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US Patent: 38,715
Improvement in air-pumps
Patentee: Rufus Porter (exact or similar names) - Melrose, MA USPTO Classifications: 417/328 Tool Categories: industrial machines : pneumatic : air pumps Assignees: Thomas F. Wells - Roxbury, MA Manufacturer: Not known to have been produced Witnesses: David T. Marston Randolph L. Stickney	Patent Dates: Granted: May 26, 1863 Antedated: Oct. 02, 1862 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: This air pump consists of six pistons operated by a grooved cylindrical cam so as to create a roughly equal flow of air throughout each cycle.

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