JOHN J WILLIAMS
Broker in Lexington, MA

6688158, Feb 10, 2004

Sep 11, 2002

10/241347

Brian T. Cunningham - Lexington MA
John R. Williams - Lexington MA

The Charles Stark Draper Laboratory, Inc. - Cambridge MA

G01N 2902

73 2406, 73 6175, 422 69, 438 49

A method for manufacturing a flexural plate wave sensor including the steps of depositing a sacrificial material layer over a silicon substrate, depositing a membrane layer over the sacrificial material layer with the membrane layer covering the sacrificial material layer and contacting the silicon substrate, depositing a piezoelectric layer over the membrane layer, forming a first transducer on the piezoelectric layer, forming a second transducer on the piezoelectric layer, spaced from the first transducer, removing the sacrificial material layer to expose a portion of the membrane layer, and depositing an absorptive coating on the exposed portion of the membrane layer.

5177252, Jan 5, 1993

Apr 11, 1990

7/508277

John R. Williams - Lexington MA

The Charles Stark Draper Laboratory, Inc. - Cambridge MA

C07C 69017

560145

Esters having the general formula ##STR1## where X is a halogen, the sum of the atomic masses of the halogen atoms on the phenyl ring is at least 90, n is 1-5, Y is an alkyl, ether, ester, aldehyde, ketone, acetal, ketal, cyano, or nitro substituent, m is 0-2, Z is an ester linkage --OCO-- or --CO. sub. 2 --, R' is a haloalkyl group containing at least one F atom and containing halogen atoms in place of greater than 60% of the hydrogen atoms of the corresponding unhalogenated alkyl group, with the sum of the atomic masses of the halogen atoms on said R' group being greater than 135 and the compound as a whole containing at least two types of halogen atoms, and p is 1-3, constitute high density flotation fluids and lubricants for inertial instruments such as gyroscopes and accelerometers, and for electrical contacts. Synthetic methods are disclosed for production of such fluids from available starting materials.

5248432, Sep 28, 1993

Apr 3, 1992

7/862822

John R. Williams - Lexington MA

Charles Stark Draper Laboratory, Inc. - Cambridge MA

C10M10554, C10M10534, C10M10536

252 515R

The invention provides a method for lubricating inertial instruments such as gyroscopes and accelerometers which require flotation fluids for operation. An exemplary process comprises introducing a fluid which contains a halogenated aryl ring, to an inertial instrument, having an axis bearing and/or a slip ring, whereby the axis bearing and/or slip ring are lubricated and the internal sensing elements are floated by the dense fluid.

5154845, Oct 13, 1992

Aug 23, 1991

7/752285

John R. Williams - Lexington MA

PCR Group, Inc. - Gainesville FL

C10M11104

252 54

There is provided a synthetic lubricant composition characterized by the presence therein of (a) a fluorinated polyether and (b) a minor amount of a soluble polyfluoro additive.

8388892, Mar 5, 2013

Nov 12, 2010

12/927364

Daniel Harjes - Allston MA, US
John Williams - Lexington MA, US
James A. Bickford - Winchester MA, US
Daniel Traviglia - Allston MA, US
David G. D'Amore - Winthrop MA, US
James D. Derouin - Taunton MA, US

The Charles Stark Draper Laboratory, Inc. - Cambridge MA

G01N 31/12, G01N 21/72, G01N 1/18, G01M 1/38, G05B 13/00, G05B 15/00, G05D 23/00, G01N 31/00

422 78, 436155, 436157, 700274, 702 24

An in-line loss-on-ignition measurement system includes an on-site extractor subsystem configured to collect fuel or a combustion by-product from a hydrocarbon fuel burning plant. An on-site analyzer is configured to receive the collected matter from the extractor subsystem and configured to weigh the collected matter, burn the collected matter, and weight the collected matter again. A controller is responsive to the analyzer and is configured to determine the loss-on-ignition data for the plant based on the weight of the collected matter before and after it is burned in the analyzer.

6972553, Dec 6, 2005

Feb 14, 2002

10/075754

Anthony Petrovich - Tewksbury MA, US
John R. Williams - Lexington MA, US
Christopher E. Dubé - Lexington MA, US

The Charles Stark Draper Laboratory, Inc. - Cambridge MA

G01R023/00, G01R029/22, G01G003/16

324 7652, 324727, 324 7649, 73580

A sensor readout circuit which provides a frequency signal output including a phase detector circuit responsive to an output signal from a sensor and an input signal to the sensor and configured to detect the phase difference between the input signal and the output signal, and a drive circuit responsive to the phase detector circuit and configured to maintain a fixed phase difference between the input signal and the output signal.

2004014, Jul 22, 2004

Nov 26, 2003

10/723332

John Williams - Lexington MA, US
Megan Owens - Somerville MA, US

G01N025/00

374/014000

A TGA based on a microelectromechanical system (MEMS) architecture and employing a flexural plate wave (FPW) mass sensor provides substantially improved mass sensitivity at a significantly reduced cost in comparison to traditional TGAs. The output of an FPW reference sensor is monitored to determine and compensate for any thermally-induced output of the FPW mass sensor.

7171844, Feb 6, 2007

Feb 13, 2006

11/352610

Brian T. Cunningham - Lexington MA, US
John R. Williams - Lexington MA, US

The Charles Stark Draper Laboratory, Inc. - Cambridge MA

G01N 5/04, G01N 25/08

73 73, 73580, 73 6175, 374 27

An apparatus for measuring the mass of a substance includes a sensor having a membrane layer, the membrane for receiving the substance thereon, an oscillator device for driving the membrane at a reference resonant frequency, a frequency detection device for determining a change in the reference resonant frequency caused by the presence of the substance on the membrane, and a mass determining device for determining the mass of the substance, the change in the reference resonant frequency being indicative of the mass of the substance.

2006007, Apr 13, 2006

Oct 4, 2005

11/243941

Megan Owens - Waltham MA, US
Marco Bonne - Carlisle MA, US
Tai Chan - Brookline MA, US
John Williams - Lexington MA, US

G01N 33/02

426231000

Embodiments of the present invention are directed to methods and devices for determining freshness of food products, and materials and devices related thereto. In some embodiments, a sensor device is provided which may include an ergonomic body including a slot for receiving a sensor card, a microcontroller, a plurality of LEDs for displaying operational status of the sensor device and/or displaying a result and audio means for audibly presenting operation status of the sensor device and/or audibly presenting a result. The device may also include a control program operating on the microcontroller for operating the sensor device and for determining a freshness of food, a first air inlet for placement proximate to a food product to receive air from around a food product for testing and a replaceable sensor card including a plurality of sensors an a sensor card inlet and a sensor card outlet.

7101472, Sep 5, 2006

Mar 13, 2003

10/388202

Andrew Dineen - Melrose MA, US
John R. Williams - Lexington MA, US
Jennifer Ryan Prince - Stoneham MA, US

The Charles Stark Draper Laboratory, Inc. - Cambridge MA

G01N 27/333

205792, 205789, 204416, 204411

Ion-selective electrode sensor systems, and methods of fabricating such systems, may be utilized to analyze microfluidic sample volumes, i. e. , sample volumes on the order of 1 to 1000 microliters.