DAVID NEEDHAM SAUNDERS
Pilots at Plymouth Dr, Saco, ME

5959219, Sep 28, 1999

Jul 28, 1997

8/901373

David N. Saunders - Saco ME

G01F 128, G01F 137

7386174

A gas flow sensor particularly useful for the measurement of relatively low flow rates. The sensor includes a flexible vane affixed to a substrate. One end of the vane is conductive and is permitted to move with the flexing of the vane. That end of the vane forms part of one or more capacitors such that as the vane bends with the flow of gas therethrough, the capacitive value changes. The gas flow rate can then be determined using well-known circuitry. The vane includes a flow-restriction section to allow the gas to flow through. The vane is designed of a material and a configuration to ensure that it bends under very low flow conditions.

2003021, Nov 20, 2003

May 13, 2003

10/436648

David Saunders - Saco ME, US

A47J037/08

099/327000, 099/389000

A control system for a toaster oven incorporating a conveyor driven by an inexpensive ac motor, where the control system allows the entire range of toasting demands to be met while also compensating for variations in the line voltage. The heart of the toasting control is the reliance on the total dwell time of the bread products within the toasting zone of the oven, rather than on the speed of the motor. The control system also provides for a convection fan of varying speed without the need to replace the inexpensive muffin fan with more elaborate devices. Among the advantages offered by the dwell time approach is on-the-fly adjustment upward or downward of the degree of toasting, there being no need to await for the toasting zone to heat up or cool down to achieve this.

5627801, May 6, 1997

Jul 20, 1995

8/504594

David N. Saunders - Saco ME

G10K 912

367139

An acoustic resonance chamber in an underwater pinger is designed to enhance the acoustic emission from the pinger. An electro-acoustic transducer of the pinger is positioned away from a reflective surface of the pinger housing by a distance chosen in proportion to the wavelength of the fundamental frequency of the acoustic emission. This creates a resonant condition at the transducer, maximizing the acoustic output. This design also causes a maximum transfer of the acoustic wave through the pinger housing and into the surrounding water.

6286629, Sep 11, 2001

Feb 3, 1999

9/244236

David N. Saunders - Saco ME

B66B 300

187394

An inexpensive system for measuring and controlling the height of the platform of a lift, especially of a non-fixed lift such as fork-lift or scissors-lift. By the use of a time-monitoring microprocessor, this system carries out such measuring and controlling over a continuous range of height even though the direct-measuring operations just involve a small, discrete number of surrogate-height-markers and one or two off/on sensors. This is accomplished by incorporating into the control system (a) a geometric model relating the height of the platform to the value of a surrogate parameter and (b) dynamic model describing how the surrogate parameter changes with time during ascent and descent of the platform. With this data, the microprocessor can control the platform precisely, causing it to move to any vertical position within its normal range. The resolution is limited only by the precision of the geometric and dynamic models.

5684755, Nov 4, 1997

Aug 29, 1995

8/510190

David N. Saunders - Saco ME

H04B 102

367139

A position-dependent switch to sense deployment of an underwater pinger to enable operation upon deployment. During underwater deployment the pinger orients itself differently from an orientation chosen for the stowed (not deployed) condition. The position-dependent, or orientation-dependent, switch senses the pinger orientation and enables pinger operation automatically upon deployment. When the pinger is stowed the position-dependent switch disables the operation of the pinger.