Kirti B Chakrabarti from 5 Liberty Ln, South Lynnfield, MA 01940, Phone: 7815812620

Miniature Low-Wattage Neon Light Source
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US Patent:

52724069, Dec 21, 1993
Filed:

May 15, 1992
Appl. No.:

7/883978
Inventors:

Kirti B. Chakrabarti - Lynnfield MA
Robert E. Levin - Hamilton MA
Assignee:

GTE Products Corporation - Danvers MA
International Classification:

H01J 6142
H01J 6134
H01J 6135
US Classification:

313 25
Abstract:

A source of red light includes a double-bore capillary tube having a pair of ends and a convoluted shape. A pair of electrodes is located at one end of the capillary tube and disposed within respective bores. An ionizable medium is enclosed within the capillary tube and includes neon at a pressure from about 300 to 600 torr. When energized, the ionizable medium generates an arc discharge between the electrodes consisting primarily of radiation in the range of from 590 to 670 nanometers. An outer jacket of vitreous material may surround the capillary tube and contain an inert gas (e. g. , nitrogen) at a predetermined pressure.

Fluorescent Lamp Having Double-Bore Inner Capillary Tube
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US Patent:

51343363, Jul 28, 1992
Filed:

May 13, 1991
Appl. No.:

7/698883
Inventors:

Kirti B. Chakrabarti - Lynnfield MA
Robert E. Levin - Hamilton MA
Assignee:

GTE Products Corporation - Danvers MA
International Classification:

H01J 6142
H01J 6134
H01J 6135
US Classification:

313 25
Abstract:

A miniature, low-wattage fluorescent lamp includes a double-bore inner capillary tube having a pair of ends and a convoluted shape. The inner capillary tube is comprised of a vitreous material (e. g. , quartz) which is capable of transmitting ultraviolet radiation. A pair of electrodes (e. g. , mercury pool) is located at one end of the inner capillary tube and disposed within respective bores. An ionizable medium is enclosed within the inner capillary tube and includes an inert starting gas and a quantity of mercury. When energized, the ionizable medium generates an arc discharge between the electrodes consisting of ultraviolet radiation. A phosphor coating responsive to the ultraviolet radiation is disposed on an outer surface of the inner capillary tube and remote from the arc discharge. An outer jacket of vitreous material surrounds the inner capillary tube and contains an inert gas at a predetermined pressure.

Lamp
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US Patent:

D331560, Aug 29, 1989
Filed:

Sep 18, 1986
Appl. No.:

6/909459
Inventors:

Kirti B. Chakrabarti - Danvers MA
Donald F. Garrity - Chester NH
James L. Cashman - Salem MA
Assignee:

GTE Products Corporation - Danvers MA
US Classification:

D26 2

Electric Lamp, Base For Use Therewith And Method Of Assembling Same
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US Patent:

48048780, Feb 14, 1989
Filed:

Feb 5, 1987
Appl. No.:

7/011465
Inventors:

Harold L. Hough - Beverly MA
George J. English - Reading MA
Kirti B. Chakrabarti - Danvers MA
Assignee:

GTE Products Corporation - Danvers MA
International Classification:

H01J 550
H01J 900
US Classification:

313113
Abstract:

An electric lamp including a reflector, at least one conductive ferrule located within a surface of the reflector and a lead-in conductor electrically connected to the ferrule and extending within the reflector. The lamp includes a base having an insulative (e. g. , ceramic) cap located substantially about the ferrule, barrier means (e. g. , ceramic fiber) located within the cap to define an open chamber substantially about the ferrule, an electrical conductor (e. g. , wire) extending within the cap and electrically connected (e. g. , silver soldered) to the ferrule, and sealing means (e. g. , high temperature cement) located within the cap to provide a seal therefore. The barrier means serves to separate the sealing means from the open chamber about the ferrule such that the heat generated by the ferrule can be vented through spaced apertures located within the cap's side wall. A method of assembling a base on an electric lamp is also provided.

Lamp
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US Patent:

D391937, Jul 10, 1990
Filed:

Dec 16, 1986
Appl. No.:

6/942641
Inventors:

Kirti B. Chakrabarti - Danvers MA
Donald F. Garrity - Chester NH
James L. Cashman - Salem MA
Assignee:

GTE Products Corporation - Danvers MA
US Classification:

D26 2

Automobile Headlight With Combined Heat And Light Shield
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US Patent:

46425144, Feb 10, 1987
Filed:

Sep 28, 1984
Appl. No.:

6/655616
Inventors:

George J. English - Reading MA
Kirti B. Chakrabarti - Danvers MA
Assignee:

GTE Products Corporation - Stamford CT
International Classification:

H01K 126
US Classification:

313111
Abstract:

An automobile headlight including a reflector, a plastic lens secured to the reflector, and a light source (e. g. , tungsten halogen capsule) located within and surrounded by the reflector. Means for preventing light transmission through a preselected portion of the lens is provided, said means also substantially preventing heat buildup on the lens. In one embodiment, this means comprises a layer of mica located on the internal surface of the lens and having thereon a thin layer of aluminum. The aluminum serves as a substrate for a dark coating (e. g. , black paint).

Miniature Low-Wattage Neon Light Source
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US Patent:

51534797, Oct 6, 1992
Filed:

May 13, 1991
Appl. No.:

7/698882
Inventors:

Kirti B. Chakrabarti - Lynnfield MA
Robert E. Levin - Hamilton MA
Assignee:

GTE Products Corporation - Danvers MA
International Classification:

H01J 6142
H01J 6134
H01J 6135
US Classification:

313 25
Abstract:

A source of red light includes a double-bore capillary tube having a pair of ends and a convoluted shape. A pair of electrodes is located at one end of the capillary tube and disposed within respective bores. An ionizable medium is enclosed within the capillary tube and includes neon at a pressure from about 300 to 600 torr. When energized, the ionizable medium generates an arc discharge between the electrodes consisting primarily of radiation in the range of from 590 to 670 nanometers. An outer jacket of vitreous material may surround the capillary tube and contain an inert gas (e. g. , nitrogen) at a predetermined pressure.

Heat Shield For Low Profile Automotive Headlight
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US Patent:

48149594, Mar 21, 1989
Filed:

Feb 25, 1988
Appl. No.:

7/160363
Inventors:

Kirti B. Chakrabarti - Danvers MA
George J. English - No. Reading MA
Assignee:

GTE Products Corporation - Danvers MA
International Classification:

F21V 2900
US Classification:

362294
Abstract:

A motor vehicle headlight module is provided which is compact in design having a plastic reflector with a protruding rear portion forming a chamber from which a lighting capsule extends. A heat shield of thermal insulative material is disposed above the capsule and in spaced relation with the capsule and reflector to inhibit the reflector from reaching its heat deflection temperature.

Kirti B Chakrabarti