John M Sousa

US Patent:

6348358, Feb 19, 2002

Filed:

Jan 18, 2000

Appl. No.:

09/484992

Inventors:

John Gary Sousa - Hudson NH
Josh P. Foster - Windham NH
Thomas C. Dearman - Oro Valley AZ

Assignee:

Presstek, Inc. - Hudson NH

International Classification:

H01L 2100

US Classification:

438 22, 438 26, 438 33, 438456

Abstract:

A linear array of diode laser emitters is manufactured with sufficient thermal and electronic isolation among the emitters to permit separate addressability. The emitter bar has first and second opposed surfaces and a third surface through which the emitters direct output. A first surface of the emitter bar is affixed to a âstandoffâ element that has conductive surfaces connecting each emitter to a power source; these connections are maintained after a series of spaces is formed between the emitters of the emitter bar. The second surface of the emitter bar is affixed to a heat sink to form a finished assembly.

US Patent:

6452623, Sep 17, 2002

Filed:

Apr 20, 2001

Appl. No.:

09/839506

Inventors:

John Gary Sousa - Hudson NH

Assignee:

Presstek - Hudson NH

International Classification:

B41J 2700

US Classification:

347256, 347241

Abstract:

A single laser crystal is driven with multiple pumping sources to obtain discrete, collimated outputs without substantial thermal crosstalk, so that the action of one pumping source does not adversely interfere with the action of another source driving the same crystal; that is, an imaging output emanating from one crystal region will neither defeat nor spuriously cause an imaging output in another region.

US Patent:

6860870, Mar 1, 2005

Filed:

Dec 21, 2001

Appl. No.:

10/034836

Inventors:

Dean M. Pichon - Arlington MA, US
David J. Nedder - Attleboro MA, US
John R. Sousa - Littleton MA, US
J. Jeffrey Kablik - Tyngsboro MA, US
Albert H. Linder - Hagen, DE

Assignee:

Focal, Inc. - Lexington MA

International Classification:

A61M005/00

US Classification:

604191, 604 82, 604187, 604118, 604121, 604119, 604173, 222135, 2223865, 222630, 222389, 222263, 606213

Abstract:

A gas powered spraying device that can be used for single or multi-part reactive medical polymer compositions is provided. A fluid or one or more reactive solutions are sprayed independently at a tissue surface, and the spraying of each solution of multi-component embodiments is controlled by a separate valve. Each solution is provided with a separate spray outlet, and each spray outlet is surrounded by an annular sheath of flowing gas. Gas flow is provided at two or more flow levels, including a high level flow for active spraying and a low level bypass flow to remove drips and prevent clogging, which can improve device reliability. Gas pressure can be used to drive fluid to its spray outlet, as well as to spray the fluid from the outlet to the tissue surface.

US Patent:

7525562, Apr 28, 2009

Filed:

May 3, 2005

Appl. No.:

11/121310

Inventors:

John Gary Sousa - Hudson NH, US

Assignee:

Presstek, Inc. - Hudson NH

International Classification:

B41J 2/45
H01S 3/08

US Classification:

347238, 372103

Abstract:

Cavity lasers exhibit a relatively high beam quality (e. g. , M

US Patent:

60914343, Jul 18, 2000

Filed:

Apr 29, 1998

Appl. No.:

9/069692

Inventors:

John Gary Sousa - Hudson NH

Assignee:

Presstek, Inc. - Hudson NH

International Classification:

B41J 239

US Classification:

347149

Abstract:

Optimization of distances between each of an array of imaging devices and the surface of an oppositely disposed rotating drum is accomplished without disturbing the mechanical mounting of the imaging devices. For each device, an optimal distance from the recording construction is established; at this optimal distance, corresponding to substantially proper focus, maximum energy density is delivered to a recording medium on the drum. Rather than alter the actual device-to-drum distance to conform to this optimum, the optical paths between the devices and the drum are changed by varying the spacing between the radiation source (e. g. , the end of a fiber-optic cable) and the assembly. This alters the point of focus, and therefore has the same practical effect as moving the device itself. The invention also provides a technique for determining the optimal device-to-drum distance by means of a sequence of imaged regions applied at different device-to-drum distances.

US Patent:

49281127, May 22, 1990

Filed:

Mar 23, 1987

Appl. No.:

7/028924

Inventors:

Allan G. Hock - Londonderry NH
John R. Larson - Hamstead NH
John G. Sousa - Nashua NH

Assignee:

Howtek, Inc. - Hudson NH

International Classification:

G01D 1516
B41J 304

US Classification:

346 25

Abstract:

An ink curing apparatus for use with an ink jet printer that discharges liquefied ink is disclosed. The apparatus includes a shell assembly disposed around the portion of the printer imaging assembly that includes the ink jets. The imaging assembly and the shell wall are shaped so that a first cavity is formed between the imaging assembly and the paper printed on, and a second cavity is formed between the paper and the shell wall. A pair of fans are arranged to draw air currents over both sides of the portion of the paper that is being printed on. The air currents cool the paper so the ink solidifies upon contact with the paper and does not soak through it. The air currents also insure that the ink solidifies at a uniform rate regardless where it is applied on the paper. This insures the final image on the paper has a uniform appearance. The air currents also urge the portion of the paper being printed on against a frame structure that is an integral part of the shell so as to secure the paper during the printing process.

US Patent:

62225790, Apr 24, 2001

Filed:

Jun 16, 1999

Appl. No.:

9/334364

Inventors:

John Gary Sousa - Hudson NH

Assignee:

Presstek, Inc. - Hudson NH

International Classification:

B41J 1514

US Classification:

347241

Abstract:

A fixture containing a plurality of parallel optical fibers is aligned using a solder circuit that is itself mounted on the surface. The fixture is positioned on the circuit so as to be in contact with a quantity of solder. With the solder in the molten state, the fixture is aligned with respect to an element receiving light output from the optical fibers, and the alignment is secured by allowing the solder to solidify with the fixture immobilized.

US Patent:

58223452, Oct 13, 1998

Filed:

Jul 8, 1996

Appl. No.:

8/676470

Inventors:

John G. Sousa - Hudson NH
Josh Foster - Nashua NH
Wayne Mueller - Londonderry NH

Assignee:

Presstek, Inc. - Hudson NH

International Classification:

H01S 310

US Classification:

372 38

Abstract:

A laser system for imaging graphic-arts constructions avoids the need to demagnify a divergent beam by using the output of a semiconductor or diode laser to optically pump a laser crystal, which itself emits laser radiation with substantially less beam divergence. A preferred implementation utilizes, as a pumping source, at least one laser device that emits in the IR, and preferably near-IR region, to image ablative or transfer-type printing members. The output of the pumping source is provided to the laser crystal via a focusing lens arrangement. The output of the laser crystal, in turn, is focused onto the surface of a recording medium to perform the imaging function. Crystal excitation and decay times are minimized by continuously maintaining the pumping source at a bias power level, which keeps the crystal at a continuous, baseline power level just short of lasing or imaging; and then selectively and intermittently increasing power to the pumping source to cause the crystal to lase (or lase at higher power) in an imagewise pattern. By selectively varying the pulse width within certain limits, it is possible to obtain image dots of different sizes while retaining a round dot shape.