GB Patent: 178,401,432 - Improvements on Steam or Fire Engines-Three Bar Motion and Steam Carriage


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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 (exact or similar names) - Birmingham, West Midlands County, England

USPTO Classifications:

Tool Categories:

propulsion and energy : steam engines

metalworking machines : forging machines : drop hammers

Assignees:

None

Manufacturer:

Boulton & Watt - Birmingham, West Midlands County, England

Witnesses:

Unknown

Patent Dates:
Granted:	Apr. 28, 1784

Patent Pictures:

Espacenet patent
Report data errors or omissions to steward Joel Havens
Wikipedia biography of James Watt
Patent Specification
"Vintage Machinery" entry for Boulton & Watt

Description:

Note: Early English patents were not originally numbered but they were later assigned consecutive numbers that run from #1 of 1617 to #14359 of September 1852. From Oct 1852 until 1916, patents were numbered by the year and started at patent #1 at the start of each year in January. The patent number used in DATAMP represents the year of issue and the patent number. This patent is #933 issued in the year 1769

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. The patent specification also described the concept of the steam hammer, which is believed to be the first time that this idea was ever written down.