David B Lieberman

US Patent:

20130272338, Oct 17, 2013

Filed:

Apr 16, 2012

Appl. No.:

13/447840

Inventors:

David Samuel Lieberman - San Francisco CA, US

International Classification:

G01K 17/00

US Classification:

374 31, 374E17003

Abstract:

Methods and devices for improved membrane-based microcalorimeters are disclosed. The sample mixing speed or “temporal addenda” of the calorimeter can be improved using membranes with patterned hydrophilic and hydrophobic regions, oscillating droplet squeezing methods, and textured membrane surfaces with ridges designed to facilitate rapid mixing. The thermal coupling between the membranes and the other calorimetric addenda can be minimized by exposing the back side of the calorimetric membrane to a vacuum, while keeping the front side exposed to a humidified environmental chamber. Specially shaped, membrane associated heat-transfer-elements can help the system accurately monitor substantial portions of the sample. These elements, in conjunction with the position of the edge of the sample, can be designed to minimize inaccuracy due to edge evaporation effects. These improvements, which may be applied either individually or collectively, can reduce the distorting effect that slow mixing, addenda, thermal fluctuations, and edge effects have on microcalorimetric measurements.

US Patent:

43130364, Jan 26, 1982

Filed:

Feb 19, 1980

Appl. No.:

6/122415

Inventors:

Michael D. Jabara - San Francisco CA
Charles H. Jolissaint - Sunnyvale CA
David Lieberman - Palo Alto CA
John D. Edwards - Campbell CA

Assignee:

Rolm Corporation - Santa Clara CA

International Classification:

H04M 706

US Classification:

179 18AD

Abstract:

A distributed CBX system which provides a virtual network between remotely located CBXs is disclosed. The CBXs are connected to both a voice network and a packet network. A first CBX may interrogate a second CBX to determine, by way of example, the status of a called station at the second CBX over the packet network. The second CBX not only provides the status of the called station but also provides, if the called station is clear, the number of a free incoming line at the second CBX. In this manner, the first CBX can place a call to both an available line and station at the second CBX. Alternatively, because of facility availability or tariff structures, the call may be originated over common carrier facilities in the reverse direction originating over common carrier facilities from the called party end.