David A Robins

US Patent:

8462662, Jun 11, 2013

Filed:

Oct 29, 2009

Appl. No.:

12/608837

Inventors:

David S. Robins - Buffalo Grove IL, US

Assignee:

Google Inc. - Mountain View CA

International Classification:

H04L 12/28
H04L 12/26

US Classification:

370254

Abstract:

A data communications network, for which presence information is maintained for wireless data communication devices forming nodes of the network, includes: a presence server; and a plurality of nodes formed by the wireless data communication devices, each of the devices configured to send periodic check-in messages to the presence server. The presence server is configured to send an acknowledgment in response to a check-in message. Each of the wireless data communication devices is configured to reset a timer associated with the sending of the check-in messages by it upon (i) communicating, as an intermediate node, a check-in message originating at another node, and (ii) communicating, as an intermediate node, a corresponding acknowledgment originating at the presence server. The presence server is configured to update presence information of wireless data communication device from which a check-in message originates and each intermediate node.

US Patent:

20130044637, Feb 21, 2013

Filed:

Sep 14, 2012

Appl. No.:

13/620227

Inventors:

David S. Robins - Buffalo Grove IL, US

International Classification:

H04W 88/00

US Classification:

370254

Abstract:

A data communications network, for which presence information is maintained for wireless data communication devices forming nodes of the network, includes: a presence server; and a plurality of nodes formed by the wireless data communication devices, each of the devices configured to send periodic check-in messages to the presence server. The presence server is configured to send an acknowledgment in response to a check-in message. Each of the wireless data communication devices is configured to reset a timer associated with the sending of the check-in messages by it upon (i) communicating, as an intermediate node, a check-in message originating at another node, and (ii) communicating, as an intermediate node, a corresponding acknowledgment originating at the presence server. The presence server is configured to update presence information of wireless data communication device from which a check-in message originates and each intermediate node.

US Patent:

53275730, Jul 5, 1994

Filed:

Mar 12, 1993

Appl. No.:

8/068830

Inventors:

Vitaly Lenchik - Lake Zurich IL
Robert W. Furtaw - Schaumburg IL
David S. Robins - Buffalo Grove IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 336

US Classification:

455 14

Abstract:

An intersystem communication path (20, 67) can be established on an as needed basis. Already established paths are fully utilized before new paths are established. Already established paths can be automatically disconnected when no longer needed, or when existing calls can be merged on to fewer lines. Dial up lines can be mixed with dedicated lines. If desired, excess capacity can be guaranteed to accommodate high traffic conditions and/or other conditions that precipitate a likely need for communication services between systems.

US Patent:

44452233, Apr 24, 1984

Filed:

Jan 5, 1981

Appl. No.:

6/222422

Inventors:

Steven C. Jasper - Schaumburg IL
Robert V. Janc - Palos Heights IL
David S. Robins - Buffalo Grove IL
Michael H. Retzer - Schaumburg IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03K 378

US Classification:

375 96

Abstract:

An apparatus and method for determining the period and frequency of a signal intefering with a desired Loran C signal are provided. A sample of the interfering signal is generated at a time corresponding to the peak of the autocorrelation function of the interfering signal with respect to the predetermined pulse tracking reference point of the Loran C signal. Indicia of the period and frequency of the interferer is obtained from the timing of the sample generated at the autocorrelation function peak.

US Patent:

43778666, Mar 22, 1983

Filed:

Jan 5, 1981

Appl. No.:

6/222458

Inventors:

Robert V. Janc - Palos Heights IL
David S. Robins - Buffalo Grove IL
Michael H. Retzer - Schaumburg IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G01S 124

US Classification:

375 94

Abstract:

Loran C signal processing apparatus is provided which employs a single signal channel or path to process and sample Loran C RF signals and envelope derived Loran C RF signals which in conventional approaches are processed and sampled in separate signal paths.

US Patent:

43707483, Jan 25, 1983

Filed:

Jan 5, 1981

Appl. No.:

6/222423

Inventors:

Robert V. Janc - Palos Heights IL
David S. Robins - Buffalo Grove IL
Michael H. Retzer - Schaumburg IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 2706

US Classification:

375 94

Abstract:

The presence of a pulsed radio frequency signal is detected by periodically sampling such signal with first and second sampling strobes in quadrature relationship. The first and second strobes are separately accumulated for a first period of time overlapping a second period of time during which the first and second strobes are also accumulated. The four sums resulting from such accumulations are compared with a predetermined threshold level to determine the presence of the pulsed radio frequency signal.

US Patent:

44160178, Nov 15, 1983

Filed:

Jan 5, 1981

Appl. No.:

6/222459

Inventors:

Steven C. Jasper - Schaumburg IL
Robert V. Janc - Palos Heights IL
David S. Robins - Buffalo Grove IL
Michael H. Retzer - Schaumburg IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 1500

US Classification:

375 99

Abstract:

A method and apparatus for attenuating an interfering signal corrupting a desired Loran C signal is provided. An interfering signal sample is determined which occurs at the peak of the autocorrelation function of the interfering signal such that the period of the interferer is known. The sample occurring at the peak of the autocorrelation function is added to or subtracted from the desired Loran C signal sample taken at a predetermined reference point during the pulses thereof such that the interfering signal is cancelled or substantially attenuated.

US Patent:

42164630, Aug 5, 1980

Filed:

Aug 10, 1978

Appl. No.:

5/932734

Inventors:

Charles A. Backof - Hoffman Estates IL
David S. Robins - Schaumburg IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 910
H03K 1302
G06F 305
G01K 2500

US Classification:

340171R

Abstract:

A plurality of up/down counters are controlled by a programmed digital reference signal. The combination of a high select signal and a high input signal causes any one of the counters to increment (up) by one count while a combination of a high select signal and a low input signal causes any one of the counters to decrement (down) one count. A threshold detector signals on output when a specific combination of the counters reaches a predetermined combination count signifying correlation of the programmed reference with the input tone over a predetermined number of cycles. The phase of the input may be determined by noting which of the counters reaches the predetermined threshold.