David Schwartz Barth

US Patent:

20210334294, Oct 28, 2021

Filed:

Oct 5, 2018

Appl. No.:

16/603548

Inventors:

- Mountain View CA, US
David Barth - Mountain View CA, US
Brett McLarnon - Mountain View CA, US
Jennifer Maurer - Seattle WA, US

International Classification:

G06F 16/29
H04W 4/021
H04W 64/00

Abstract:

Geographic data corresponding to a certain geographic area of offline coverage is stored in a memory of a computing device. An indication of a geographic boundary delimiting a region smaller than, and contained within, the geographic area is obtained. A current location of the computing device relative to the geographic boundary is determined and, in response to determining that the current location is outside the region, additional geographic data is retrieved via a wireless communication network to expand the geographic area of offline coverage. At least some of the geographic data corresponding to the expanded geographic area is provided via a user interface of the computing device when the computing device is offline.

US Patent:

20150140427, May 21, 2015

Filed:

Nov 14, 2014

Appl. No.:

14/542145

Inventors:

Xiang Zhang - Alamo CA, US
Jia Zhu - San Jose CA, US
Christopher Gladden - Aptos CA, US
David Barth - Berkeley CA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

H01M 4/38
H01M 4/04
C01B 33/02

US Classification:

4292181, 423348, 428220, 205 57

Abstract:

Various embodiments of the invention describe nanoporous silicon (Si) network thin films with controllable porosity and thickness that are fabricated by a robust and scalable electrochemical process, and then released from Si wafers and transferred to flexible and conductive substrates. These nanoporous Si network thin films serve as high performance Li-ion battery electrodes, with an initial discharge capacity of 2570 mA h g, above 1000 mA h gafter 200 cycles without any electrolyte additives.