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US Patent: 4,704
Improvement in wood-screws
Patentee:
Thomas J. Sloan - New York, NY

USPTO Classifications:
109/41, 411/386

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
William H. Bishop
A. P. Browne

Patent Dates:
Granted: Aug. 20, 1846

Reissue Information:
Reissued as RE107 (Feb. 22, 1848)

Patent Pictures:
USPTO pdf tiff
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Description:
This is the patent for the common wood-screw. The innovation is the threaded portion that is straight for most of its length, combined with the tapered tip; previous screws either were straight for the entire threaded portion, or tapered for the entire threaded portion. Patent 9,688 covers Sloan's machine to make these screws.

According to the 1873 "Subject-matter index of patents for inventions issued by the United States Patent Office", this patent was granted an extension.

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