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US Patent: 5,989X
Screw cog for ships' blocks (Sheave cog)
Screw cog for shives of ship blocks
Patentee:
Rhodes Kingsbury (exact or similar names) - Bath, ME

USPTO Classifications:
474/166

Tool Categories:
structures : nautical : dry docks : blocks and wedges

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Granted: May 22, 1830

Patent Pictures:
USPTO (New site tip)
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Report data errors or omissions to steward Joel Havens
Description:
Most of the patents prior to 1836 were lost in the Dec. 1836 fire. Only about 2,000 of the almost 10,000 documents were recovered. Little is known about this patent. Only the patent drawing is available. This patent is in the database for reference only.

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