Device for the calculation of the characteristics of rectilinear geometric shapes
US4417399A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1982 |
| Grant date | Nov 29, 1983 |
| Priority date | — |
| Expiry date | Mar 30, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S33/09
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Device for the calculation of the geometrical characteristics of rectangles for the framing of various objects, usable especially in photography, architecture, industrial design. This device comprises a plate in which there is formed a preferably square aperture and which carries a graduation indicating a series of ratios between the contiguous sides of rectangles, a ruler mounted for pivoting on the plate and graduated in length, and an element mounted for pivoting on a slider displaceable on the ruler, the element having two perpendicular arms graduated in length, the element being capable of being locked in any desired angular position as a function of the rectangle to be defined. The invention permits of framing rectangles within predetermined limits, easily and with precision, indicating instantaneously to the user the geometrical characteristics of these rectangles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.