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US Patent: 516X
Preparation of quercitron (black oak bark) for export or home use
Patentee: Thomas Benger (exact or similar names) - Unknown, PA USPTO Classifications: Tool Categories: manufacturing : manufacturing processes : dyeing materials Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Granted: Jan. 25, 1804 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: This patent's specification and drawings were lost in the Patent Office fire of December 1836, and so little is known about this patent.

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