Electronic chronograph
US4094138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1975 |
| Grant date | Jun 13, 1978 |
| Priority date | — |
| Expiry date | Jul 24, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F10/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The chronograph comprises a device allowing to memorize at least two lapses of time and a subtraction device to effect the absolute difference between two lapses of time or time intervals which are memorized and preselected. The subtraction device includes: PA1 (a) a first array of complete subtractors which effect a first difference between the decimals, converted in binary numbers, forming two lapses of time memorized and selected, by taking in account an eventual carry over. PA1 (b) a second array of complete subtractors adapted to take the complement of the said first difference if the subtrahend is greater than the minuend, the carry over issued from the difference between the decimals of the greatest weight being used to form the complement number, this carry over being further used as discrimination element between the said first difference and the complementary number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.