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US Patent: 67,181
Improvement in moulds for casting metal
Patentees:
John Farrar (exact or similar names) - Providence, RI
William Groves (exact or similar names) - Providence, RI

USPTO Classifications:
106/38.28, 164/393

Tool Categories:
trade specific : foundryman

Assignees:
None

Manufacturer:
Pacific Iron Works - San Francisco, CA

Witnesses:
Socrates Scholfield
A. R. Abbott

Patent Dates:
Granted: Jul. 30, 1867

Patent Pictures:
USPTO (New site tip)
Google Patents
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Vintage Machinery entry for Pacific Iron Works
Description:
An 1872 ad from the Pacific Iron Works in San Francisco says, "We have fitted up a Foundry for the exclusive manufacture of Cast Iron GAS AND WATER PIPE by Farrar's patent process. This pipe is superior to any of Eastern or European manufacture."

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