Daniel S Lenko

US Patent:

54402328, Aug 8, 1995

Filed:

Dec 6, 1993

Appl. No.:

8/186711

Inventors:

John F. Scarzello - Columbia MD
Adam C. Feaga - Clarksville MD
Daniel S. Lenko - Monrovia MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01R 3302

US Classification:

324247

Abstract:

A portable electromagnetic field exposure dosimeter includes a triaxial fite-loaded coil sensor, a group of amplifiers and bandpass filters, a data control board, and a computer. The triaxial sensor receives electromagnetic radiation along three orthogonal axes for measurement which is channelled through a group of amplifiers and then bandpass filtered into three frequency signal ranges. One frequency range corresponds to exposure at 60 Hz and two of its harmonics. The second frequency range corresponds to high frequency pulsed energy. The third frequency range reflects body motion of a tested individual. The data control board converts such filtered signals into digital code and controls the flow of the converted data to random access memory and to the computer. The computer performs a Fast Fourier Transform on the converted data from the 60 Hz frequency range and then stores or displays the analyzed data as a function of frequency and time. The computer also stores or displays the data from the other two frequency ranges.

US Patent:

49154788, Apr 10, 1990

Filed:

Oct 5, 1988

Appl. No.:

7/254552

Inventors:

Daniel S. Lenko - Monrovia MD
Wayne R. Grine - Crownsville MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G02F 1133

US Classification:

350338

Abstract:

A liquid crystal display panel having a backlight for providing high brigess, uniformity of illumination intensity, high efficiency, and long battery life, and which can be manufactured at a low cost. The display device includes a liquid crystal display panel, a light source for illuminating the liquid crystal panel, a light passage member which can be formed of a transparent material disposed between the liquid crystal panel and the light source. The light source inlet side of the light passage member is formed with a recess with the thickness being reduced at the region diametrically opposed to the light source. A light reflecting member reflects light from the light source. Within the photoconductor, two or more of the wedged shaped photo conductor can be used for increased area of coverage.

US Patent:

59029536, May 11, 1999

Filed:

Mar 16, 1992

Appl. No.:

7/853221

Inventors:

Daniel S. Lenko - Monrovia MD
Thomas P. Frederick - Beltsville MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F42C15/188

US Classification:

102260

Abstract:

The blocking disc serving as an explosive train interrupter of a safety and rming mechanism is angularly displaced from its safe position by a stepping motor through reduction gearing in response to timed energizing pulses applied thereto from a crystal-controlled pulse generator. The blocking disc is releasably latched in its safe position by a locking rod controlling the supply and cut-off of energizing voltage to the pulse generator to accurately time displacement of the disc to an armed position.

US Patent:

44123876, Nov 1, 1983

Filed:

May 10, 1982

Appl. No.:

6/376474

Inventors:

Daniel S. Lenko - Monrovia MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01C 1728

US Classification:

33361

Abstract:

A digital compass including a two-axis earth's magnetic field sensor and a earing processor computes the bearing for local display or transmission from a remote site to a local site for display and/or storage. The bearing processor portion of the digital compass includes an analog-to-digital converter configured for ratiometric measurements to compute the ratio of the x-axis and y-axis signals (smaller divided by the larger) from the aforementioned two-axis earth's magnetic field sensor. A programmable memory unit controlled, inter alia, by the data line outputs of the analog-to-digital converter, contains the arc tangent function for angles from 0. degree. to 90. degree. The data line outputs from the memory unit defines a quadrant displacement angle in the range of 0. degree. to 90. degree. which is subsequently added to the cardinal point forming the lower boundary in bearing of the host quadrant.

US Patent:

55941958, Jan 14, 1997

Filed:

Mar 17, 1995

Appl. No.:

8/447828

Inventors:

Daniel S. Lenko - Monrovia MD
Thomas P. Frederick - Beltsville MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F24C 15188

US Classification:

102260

Abstract:

The blocking disc serving as an explosive train interrupter of a safety and rming mechanism is angularly displaced from its safe position by a stepping motor through reduction gearing in response to timed energizing pulses applied thereto from a crystal-controlled pulse generator. The blocking disc is releasably latched in its safe position by a locking rod controlling the supply and cut-off of energizing voltage to the pulse generator to accurately time displacement of the disc to an armed position.

US Patent:

6208268, Mar 27, 2001

Filed:

Apr 30, 1993

Appl. No.:

8/054166

Inventors:

John F Scarzello - Columbia MD
Daniel S. Lenko - Monrovia MD
Adam C. Feaga - Clarksville MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G08G1/01

US Classification:

340941

Abstract:

An improved detector is provided for installation in a roadway surface. The detector finds utility in a highway vehicle detection system for determining vehicle presence, vehicle speed and vehicle length. First and second matched induction coil magnetic sensors are maintained at or near the roadway surface. Each of the sensors has a longitudinal axis aligned normal to the roadway surface. The first and second sensors are separated from one another by a known distance in a direction substantially aligned with a direction of traffic flow. Each of the sensors generate a differential magnetic field signature with respect to time to indicate a passing vehicle's leading and trailing edge magnetic signatures. Vehicle speed is determined by a time-distance relationship using the leading and trailing edge magnetic signatures and the known distance. Vehicle length is determined by a time-speed relationship using the leading and trailing edge magnetic signatures and the determined vehicle speed.

US Patent:

44958480, Jan 29, 1985

Filed:

Jul 6, 1981

Appl. No.:

6/285174

Inventors:

Alexander G. Rozner - Potomac MD
Daniel S. Lenko - Silver Spring MD
James H. Carter - Silver Spring MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B23K 710
F23Q 712

US Classification:

89 11

Abstract:

A hand held, shoulder mounted gun with time delay circuitry means to safely ignite a powdered pyrotechnic material.

US Patent:

55157831, May 14, 1996

Filed:

Nov 15, 1993

Appl. No.:

8/151695

Inventors:

Philip W. Hesse - Ellicott City MD
Raymond Goetz - Baltimore MD
Daniel Lenko - Monrovia MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F42B 311

US Classification:

102206

Abstract:

Ignition current is conducted by a firing circuit through a firing pin to a rimer mixture retained by its cap within a cartridge case from which the cap is electrically separated by an insulator to effect primer ignition with reduced lock time by activation of a firing switch independently of the firing pin. Voltage for the firing circuit is derived from a battery, maintained in a charged condition by alternate voltage supply sources, and stored at an ignition firing level for a prolonged period of time to accommodate selective activation of the firing switch after the firing pin contacts the primer cap.