Time zone conversion chart for a ticket folder

Details Time zone conversion chart for a ticket folder Time zone conversion chart for a ticket folder

1992-01-07

1993-07-20

Rosenbaum, Mark

Printed matter

Transportation

281 151, 368 27, B42D 1500

Patent

active

052287220

ABSTRACT:
The present invention is directed to a travel document folder, such as an airline ticket folder, U-rail pass folder, passport holder, or the like, having a time zone conversion chart rotatably mounted to one leaf of the folder. In the preferred embodiment, the time zone conversion chart is made from mounting an inner dial to an outer dial such that the two dials share a common spindle and are arranged concentrically. A time scale in units of hours is provided on the outer dial, while geographic location divisions are provided on the inner dial. Cities around the world that are located in a common time zone are then grouped and assigned to the geographic location divisions. By rotating a local city on the inner dial into alignment with a time on the outer dial, a local reference time is established. Then by moving around the inner dial to find the desired city, it is possible to look up the local time there by reading off the outer dial the particular hour that is aligned with the desired city. In the preferred embodiment, the outer dial is imprinted into the leaf of the travel document folder.

REFERENCES:
patent: 1558898 (1925-10-01), Ledine
patent: 3587225 (1971-06-01), Keiser
patent: 3734396 (1973-05-01), Cowan
patent: 4285148 (1981-08-01), Kolar
patent: 4534581 (1985-08-01), Engh
patent: 4537576 (1985-08-01), Thorsheim et al.
patent: 4895393 (1990-01-01), Shimizu

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