Derwent derives from the Brythonic term Derventio, meaning "valley thick with oaks". It may refer to:

Places

Australia

United Kingdom

The Derwent World Patents Index (DWPI) is a database containing patent applications and grants from 44 of the world's patent issuing authorities.

Compiled in English by editorial staff, the database provides a short abstract detailing the nature and use of the invention described in a patent and is indexed into alphanumeric technology categories to allow retrieval of relevant patent documents by users.

Each record within the database defines a patent family, the grouping of patent documentation recorded at the various patent offices as protection of an invention is sought around the world. Each patent family is grouped around a Basic patent, which is usually the first published example of the invention. All subsequent filings are referred back to the Basic patent, and are referred to as Equivalent patents. On this basis, the database has some 20 million "inventions", corresponding to tens of millions of patents, with almost a million new inventions added each year. From 2008, the number format of the Basic patent identifier (the Accession number) changed, to allow up to 3.6 million records per year to be added, as the previous format only allowed a maximum of 1 million new records a year. This is due to the steady increase in unique patents filed each year.

Derwent is an 0-6-0 steam locomotive built in 1845 by William and Alfred Kitching for the Stockton and Darlington Railway (S&DR). It is preserved at Darlington Railway Centre and Museum.

Design

"Derwent" was designed by Timothy Hackworth and built by W. & A. Kitching in Darlington, England in 1845. It is similar in design to two of their 1842 locomotives, Leader and Trader., with outside cylinders fixed at the trailing end of the boiler and four-foot diameter, six-wheeled coupled wheels.

Withdrawn from service in 1869, it was sold to Pease & Partners for use on their colliery lines and spent some time at the construction of the Waskerley reservoir. It took part in the Stephenson Centenary celebrations at Newcastle in 1881 and the Queen's Diamond Jubilee in 1887.

Preservation

Derwent was presented to the North Eastern Railway (NER) in 1898 for preservation. After restoration the locomotive ran under its own steam in the 1925 Railway Centenary procession and on trials the day before the procession, achieved a speed of 12 m.p.h. Otherwise for many years it was on display alongside Locomotion No 1 on a plinth on one of the platforms at Darlington's main station, Bank Top. In the 1960s it was removed and restored in near original condition, and then moved in the 1970s to the Darlington Railway Centre and Museum located in the same building as Darlington's North Road railway station, where it remains on display on long-term loan from the National Railway Museum. It is now part of the National Collection.