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Hydraulic Memory Device

IP.com Disclosure Number: IPCOM000096600D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Truslove, DJ: AUTHOR

Abstract

This device has a plurality of pairs of cavities 10 and 11 of generally circular cross section. The cavities of each pair are connected by a restricted passage 2. A globule of liquid, such as mercury, having a high surface tension and low vapor pressure is disposed in one or the other of the cavities of each pair to denote a corresponding binary state. Adjacent the inlet ports 3 and 4 to each cavity pair 11 and 10, respectively, the cavities are preferably extended to provide a meniscus-shaped space 5 between the cavity wall and the globule. This enables fluid pressure to act over a larger area of the globule for more efficient application of shifting force to the globule.

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Hydraulic Memory Device

This device has a plurality of pairs of cavities 10 and 11 of generally circular cross section. The cavities of each pair are connected by a restricted passage 2. A globule of liquid, such as mercury, having a high surface tension and low vapor pressure is disposed in one or the other of the cavities of each pair to denote a corresponding binary state. Adjacent the inlet ports 3 and 4 to each cavity pair 11 and 10, respectively, the cavities are preferably extended to provide a meniscus- shaped space 5 between the cavity wall and the globule. This enables fluid pressure to act over a larger area of the globule for more efficient application of shifting force to the globule.

To shift memory unit A from 0 state, in which it is shown, to the 1 state, a half-select negative pressure (vacuum) pulse is applied to line Y1. Also, a half- select positive pressure pulse is concurrently applied to line X1. Thus, the fluid pressure applied via X1 to 4 of A displaces the globule leftward from 10 through 2 into 11, assisted by the suction applied via 3 to cavity 11. When more than one- half the volume of the globule is transferred from 10 to 11, the globule continues to move leftward by surface tension forces until it resides completely in 11. Conversely, to shift the memory unit C from 1 to 0 state, a half-select positive pressure pulse is applied to Y1, while a half-select negative pressure (vacuum) pulse is applied to X2.

To sense the condition of an...