On This Day - 14th April

1982

Sinclair patents the Spectrum's distinctive case design

A patent covering the distinctive external design of Sinclair's new computer has a priority date of 14 April 1982, just nine days before the ZX Spectrum was officially launched.

The design was created by Richard J. Dickinson, Sinclair Research's industrial designer, who was responsible for the distinctive appearance of the company's early computers. Dickinson designed the Spectrum's case and rubber keyboard, giving the new machine its instantly recognisable appearance.

The patent describes the ornamental design of the computer through seven drawings, showing front and rear perspective views together with front, rear, top and side views. The US design patent was subsequently granted as USD277484S on 5 February 1985.

The corresponding British application was GB1006157. The patent therefore provides a contemporary record of the physical design of the computer immediately before its public launch on 23 April 1982.
Source: Google Patents — US Design Patent USD277484S, Computer
The 14 April 1982 date is the priority date recorded for US design patent USD277484S, Computer. The patent record identifies Richard J. Dickinson as the inventor and Sinclair Research Ltd as the original assignee. The US application was filed on 13 October 1982 and the design patent was granted on 5 February 1985. The priority application is identified as GB1006157.

The patent describes the ornamental design through seven drawings showing perspective, front, rear, top and side views of the computer.

The Centre for Computing History independently identifies Dickinson as Sinclair's industrial designer and specifically states that he designed the Spectrum's rubber keyboard and the distinctive appearance of Sinclair's early computers.

Also in this month

Other historical information recorded for April.

Million Sinclair computers sold worldwide
1983

Million Sinclair computers sold worldwide

Sinclair Research announced that it had sold one million home computers worldwide, claiming to be the first company to reach that milestone. The total comprised around 130,000 ZX80s, 750,000 ZX81s and 200,000 ZX Spectrums. Sinclair also estimated that a further 600,000 Sinclair computers had been manufactured under licence by Timex for the North American market. The company said production in Dundee had reached approximately one computer every four seconds.
Source: Sinclair User April 1983
Sinclair User, issue 13, April 1983, reported Sinclair Research's claim that one million Sinclair home computers had been sold worldwide. The figures given were approximately 130,000 ZX80s, 750,000 ZX81s and 200,000 Spectrums. Sinclair additionally estimated that 600,000 computers had been manufactured under licence by Timex for North American sales. The article noted that Commodore disputed Sinclair's claim, saying that it had already passed one million sales several months earlier.
Timex Sinclair User magazine launched in the USA
1983

Timex Sinclair User magazine launched in the USA

ECC Publications launched Timex/Sinclair User, a new magazine aimed at owners of Timex/Sinclair computers in the United States. Based on the format of Britain's Sinclair User, the magazine covered reviews, projects, books and programming, with a first print run of 100,000 copies. ECC estimated that around 750,000 Timex/Sinclair machines were already in the United States and expected that figure to reach two million within a year.
Source: Sinclair User May 1983 Issue 14
Sinclair User Issue 14 reported that ECC Publications had launched Timex/Sinclair User in the United States during April 1983. The first issue had a print run of 100,000 copies and contained hardware and book reviews, projects including an EPROM blower, and a four-part BASIC programming series. The American edition had its own editorial and advertising staff, with members of the British Sinclair User team helping coordinate the launch. John Sterlicchi acted as editor-in-chief and John Ross as advertising manager.
Page Revised: 07/09/2026