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).
Letter from patent agents discussing a 'Bentley Piston' patent application and potential prior art from the Alta engine.
| Identifier | ExFiles\Box 148\1\ scan0124 | |
| Date | 28th April 1939 | |
| 1253. BRITISH, FOREIGN & COLONIAL PATENTS, TRADE MARKS & DESIGNS WALFORD & HARDMAN BROWN CHARTERED PATENT AGENTS J.{Mr Johnson W.M.} H.{Arthur M. Hanbury - Head Complaints} HARDMAN BROWN, M.A. (OXON.), A.M.I.E.E., A.I.A.E. TELEGRAMS & CABLES: PATENTS, COVENTRY. TELEPHONE: COVENTRY 3956 OUR REF. JHHB/DR YOUR REF. R/m5/R ROSLYN CHAMBERS, 47, WARWICK ROAD, COVENTRY, ENGLAND. 28th April, 1939. Messrs. Rolls-Royce Limited, Nightingale Road, D E R B Y. Dear Sirs, Re: YOUR PATENT APPLICATION ON "BENTLEY PISTON". In answer to your letter dated the 26th instant, we wish first of all to say that we measured up the lip area of the Alta piston and it seemed to us that it comprised more than one-third of the total piston area. Your provisional specification refers to the type of engine in which the lip area is to be at least one-sixth of the total piston area. Are you right, therefore, in thinking that there would only be a small anti-detonant effect in the Alta engine? If one regards the Alta engine as being a prior publication, then your complete specification would have to be a very detailed one if it were not to be wholly anticipated by such prior publication. We do not know whether, in point of fact, the Alta engine in question had any appreciable anti- | ||