Patent · US Expired

Microprocessor driven digital display alarm clock

US4415273A · kind A · utility

13Cited by

4References

10Claims

0Family size

Assignee

The Braun Corporation · DE

Inventors

Harald Hoffman · Mannheim, DE
Lothar Pacher · Mainz, DE
Peter Busch
Dan-Corneliu Raducanu · Bad Soden, DE

Key dates

Filing date	Jan 27, 1981
Grant date	Nov 15, 1983
Priority date	—
Expiry date	Jan 27, 2001

Classification

Technology area (CPC G)Physics
CPC primaryG04G17/086
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A microprocessor-based clock which has both a current time digital display and an alarm time digital display, as well as controls for setting both the current time and the alarm time either ahead or backward at selectable rates such that a single knob provides rapid setting of the setting time and a single knob provides rapid setting of the alarm time. An improved regulating circuit provides the microprocessor with a first substantially constant DC voltage and a second DC voltage limited to a given magnitude. User-accessable controls are provided for effecting a snooze alarm function, alarm setting and for disarming the alarm function for a relatively long period of time, e.g., for 24 hours. One of the controls includes strips bridgable by a conductive member such as a finger.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.