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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Query and response regarding the expiry date of the Knight patent.

Identifier  ExFiles\Box 15\6\  Scan008
Date  25th February 1911
  
Knight.

Feb.25th.1911.

Mr.Barrington 25/2/11 DB{Donald Bastow - Suspensions}/EF25211

You do not tell me the date of the expiry of the patent. Mr.Johnson refers to this in the second paragraph of his letter.

p. J.Delooze,
E.F.

[Handwritten Annotation]
W.B.S. 27.2.11
Patents expire 14 yrs after date of appl & provided the necessary fees are paid.
This patent Knight 14729/05 will consequently expire on July 18th 1919 if above conditions are complied with.
W.B.S.

[Sideways text in left margin]
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