Historedia
Episode 3 of 3

Patent Enrolled

When
29 April 1769
Where
British patent process
Part of
James Watt's Patent for the Separate Condenser

The patent specification was enrolled on 29 April 1769, completing the patenting of the separate condenser.

The specification of Patent No. 913 was enrolled on 29 April 1769. Boulton had helped Watt obtain the patent by clearing his debts and funding a prototype engine at Kinneil House. The patent was later extended to June 1800 by an Act of Parliament in 1775.

Sources

  1. James Watt Wikipedia, revision of 2026-08-22
  2. Watt steam engine Wikipedia, revision of 2026-09-20

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.