David C Larson

7190639, Mar 13, 2007

Jan 13, 2004

10/756003

David C. Larson - Mount Prospect IL, US

G01N 11/06

368113, 73 5413

An apparatus uses electrical conductance to determine the start and stop times for viscosity measurements using efflux cups. An efflux cup and two probes are immersed and removed from the fluid. An electric current is applied between each probe and the efflux cup. A timer measures the elapsed time between a decrease in the electric current measured between a first probe and the efflux cup and a decrease in the electric current measured between a second probe and the efflux cup.

20030004773, Jan 2, 2003

Mar 14, 2002

10/097755

Kevin Clark - Chicago IL, US
David Larson - Chicago IL, US
Tze-John Tang - Chicago IL, US
Vladimir Tokarskiy - Chicago IL, US

Objectsoft, Inc. - Chicago IL

G06F017/60

705/008000

A scheduling system to schedule events with one to many people using invitations with optional dates, times and locations to determine the soonest or the best date and time along with location for the event. When scheduling meetings, it is often necessary to determine the soonest or best date, time and location to meet between multiple people using different calendar systems. The process is time consuming and requires two or more parties to coordinate the schedules of many people. With the scheduling system of this invention, invitations are sent with optional times. Invited participants are polled for the soonest or best date, time and location to conduct the event. Through a asynchronous polling mechanism, the soonest or best available time along with best location may be determined between people on different calendar systems.

20070033048, Feb 8, 2007

Dec 9, 2005

11/298383

Barry Pollard - Chicago IL, US
Jeff Chardell - Deerfield IL, US
Jon Kozuch - Chicago IL, US
James Royalty - Chicago IL, US
David Larson - Chicago IL, US

G10L 13/08

704260000

A method of producing personalized posters, calendars, and the like (“printed products”) which enables consumers to select from a store of stored images or other digital assets, which may include copyrighted subject matter. The system allows a user to select a stored digital asset for a printed product and incorporate a personalized text message therewith. In order to prevent offensive textual messages, the system includes a text filter for blocking personalized textual material that may be offensive. In an optional embodiment, the system may also include a royalty tracking engine for automatically tracking royalties due for each copyrighted asset produced.

44916981, Jan 1, 1985

Jun 17, 1982

6/389423

David A. Larson - Downers Grove IL
Daniel A. Schumaker - LaFayette IN

H04R 1900
H04R 714

1791155PV

The transducer diaphragm includes a folded sheet of thin film material, having a front surface and having a plurality of rearwardly extending projections in the form of fins or vanes thereon. Each one of the projections has at least one conductor portion disposed thereon. A substantially flat, thin sheet is secured to form the front face of the diaphragm and to help rigidify the folded sheet. In the preferred form of the invention, each one of the projections is generally channel-shaped throughout its length, and has a bight portion interconnecting a pair of leg portions. In one form of the invention, at least one portion of a conductor is disposed on each one of the projections. The diaphragm is made from a blank, which includes the sheet of film material having a pair of similar conductors, each configured in a similar manner and deposited on the opposite sides thereof in an oppositely disposed confronting relationship and in registration with one another, so that the blank can be readily folded to form the diaphragm, without causing it to bow or otherwise be deformed.

47035102, Oct 27, 1987

Dec 20, 1984

6/684389

David A. Larson - Downers Grove IL

H04R 702
H04R 904

381196

The transducer diaphragm includes a folded sheet of thin film material, having printed circuit conductors formed thereon in a Greek or serpentine pattern. The Greek pattern includes an odd number of spaced, parallel, printed conductor lines formed into longitudinal and transverse groups, with return conductors extending around the perimeter of the pattern to complete loops of a voice coil. The sheet is folded to form a plurality of rearwardly extending projections, with the folding being along the center lines of each of the longitudinal groups. In the preferred form of the invention, each one of the projections is generally channel-shaped throughout its length, and has a bight portion interconnecting a pair of leg portions, with a longitudinal conductor in the center of the bight and other conductors in the longitudinal group opposite each other on the leg portions.

47502576, Jun 14, 1988

May 29, 1986

6/868658

David A. Larson - Downers Grove IL

LFF & Associates - San Diego CA

H04R 3100

29594

The method of making the diaphragm includes pressing on the front face of a film at spaced apart areas to deform it progressively into a series of closely-spaced generally U-shaped projections. A manufacturing device presses the sides of the projections inwardly to rigidify them. The transducer magnet assembly includes a series of elongated magnet pole-piece strips which confine magnets and are arranged in parallel spaced-apart rows with the ends thereof fitted into transverse elongated grooves extending within a pair of elongated cross-piece end members. The driver is fixed together in a precise manner by flowing an adhesive material into the grooves, and then by allowing such material to harden.

46047921, Aug 12, 1986

Dec 20, 1984

6/684379

David A. Larson - Downers Grove IL

LFF & Associates - San Diego CA

H04R 3100

29594

The method of making the diaphragm includes pressing on the front face of a film at spaced apart areas to deform it progressively into a series of closely-spaced generally U-shaped projections. A manufacturing device presses the sides of the projections inwardly to rigidify them. The transducer magnet assembly includes a series of elongated magnet pole-piece strips which confine magnets and are arranged in parallel spaced-apart rows with the ends thereof fitted into transverse elongated grooves extending within a pair of elongated cross-piece end members. The driver is fixed together in a precise manner by flowing an adhesive material into the grooves, and then by allowing such material to harden.

45366233, Aug 20, 1985

Oct 13, 1983

6/503947

David A. Larson - Downers Grove IL

H04R 900
H04R 714

179115R

The transducer diaphragm includes a folded sheet of thin film material, having a front surface and having a plurality of rearwardly extending projections in the form of fins or vanes thereon. Each one of the projections has at least one conductor portion disposed thereon. A substantially flat, thin sheet is secured to form the front face of the diaphragm and to help rigidify the folded sheet. In the preferred form of the invention, each one of the projections is generally channel-shaped throughout its length, and has a bight portion interconnecting a pair of leg portions. In one form of the invention, at least one portion of a conductor is disposed on each one of the projections. The diaphragm is made from a blank, which includes the sheet of film material having a pair of similar conductors, each configured in a similar manner and deposited on the opposite sides thereof in an oppositely disposed confronting relationship and in registration with one another, so that the blank can be readily folded to form the diaphragm, without causing it to bow or otherwise be deformed.