Stephen H Campbell

US Patent:

43365833, Jun 22, 1982

Filed:

Dec 15, 1980

Appl. No.:

6/216132

Inventors:

Stephen J. Campbell - Needham MA
Warren E. Hambly - West Bridgewater MA
George C. Harrison - Chelmsford MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

H02M 3335

US Classification:

363 21

Abstract:

A DC-to-DC converter charges a capacitor connected to the secondary of a transformer having a primary connected to a low-level power supply through an input control circuit which, when triggered, connects the power supply to the primary for only a predetermined time interval whereby current flows in the primary establishing a magnetic field that stores energy derived from the power supply. When the current in the primary is interrupted, the field collapses, inducing current to flow in the secondary thereby transferring energy from the field to the capacitor. The control circuit is triggered by a voltage sensor that detects the collapse of the field to zero. The voltage sensor includes a sensor inductively coupled to the magnetic field for developing a sensed voltage having a first level during collapse of the field and a second level after the field collapses to zero, the breakpoint between the levels defining the instant at which the field collapses to zero. A level detector detects the break point in the sensed voltage and triggers the control circuit.

US Patent:

20220297733, Sep 22, 2022

Filed:

Mar 16, 2021

Appl. No.:

17/202693

Inventors:

- Seattle WA, US
Tim Martin - Andover MA, US
Kaushal Mehta - Seattle WA, US
Stephen T. Campbell - Waban MA, US

Assignee:

Amazon Technologies, Inc. - Seattle WA

International Classification:

B62B 3/02
B65D 21/08
B62B 3/00
B62B 3/14
B62B 5/00

Abstract:

Systems and methods are disclosed for foldable containers for manual and robotic use. In one embodiment, an example foldable container may include a first container wall, a second container wall configured to rotate outwards in a first direction with respect to the first container wall, and a bottom container platform configured to rotate outwards in a second direction with respect to the first container wall. The bottom container platform may include an automatic locking mechanism configured to engage with the second container wall when the foldable container is in an unfolded position, where the second direction is perpendicular to the first direction. Some embodiments may include a number of wheels. The foldable container may be configured to be transported using (i) the plurality of wheels via manual pushing, and (ii) robotic manipulation to lift and move the foldable container.

US Patent:

20190291956, Sep 26, 2019

Filed:

Mar 23, 2018

Appl. No.:

15/934251

Inventors:

- Seattle WA, US
Stephen T. Campbell - Waban MA, US
Peter Thomas Colantonio - North Andover MA, US
David William Guerin - Boylston MA, US
Jude Royston Jonas - Hudson NH, US
Kevin John Trenholme - Stow MA, US

International Classification:

B65G 1/137
G05D 1/02
B60P 1/64
G05D 1/00
B66F 9/06
B25J 5/00

Abstract:

A mobile drive unit includes a pivot between the front chassis unit and the rear chassis unit, which both support a support structure that pivotally supports a payload housing.