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GB Patent: GB-178,401,432
Improvements on steam or fire engines—three bar motion and steam carriage
Patentee:
James Watt - Birmingham, England

USPTO Classifications:

Tool Categories:
propulsion and energy : steam engines

Assignees:
None

Manufacturer:
Boulton & Watt - Birmingham, England

Witnesses:
Unknown

Patent Dates:
Granted: Apr. 28, 1784

Patent Pictures:
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Wikipedia biography of James Watt
Description:
This patent covers aspects of Watt's double-acting engine, where steam pressure was alternately applied to either side of the piston. This was also an "expansive" engine, meaning that it used steam under greater-than-atmospheric pressure.

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