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] x228 | ||