Invertible trackball

Details Invertible trackball Invertible trackball

1989-07-14

1991-04-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340709, G01V 904

Patent

active

050085280

ABSTRACT:
The present invention relates to cursor control devices for computers, and particularly relates to cursor control devices for personal computers which involve the use of a ball rotatable by the fingers for controlling cursor movement.

REFERENCES:
patent: 4533830 (1985-08-01), Beauprey
patent: 4562347 (1985-12-01), Hovey et al.
patent: 4623787 (1986-11-01), Kim
patent: 4801931 (1989-01-01), Schmidt
patent: 4806917 (1989-02-01), Hosogoe
patent: 4831736 (1989-05-01), Bryant, Sr.

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