Electric lamp and discharge devices – With envelope – Having base and connector
Reexamination Certificate
2008-08-22
2011-11-15
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
With envelope
Having base and connector
C313S315000
Reexamination Certificate
active
08058788
ABSTRACT:
A method of manufacturing a flash-free lamp base (10), wherein the lamp base (10) comprises a shell (14), an eyelet (16) and a glass, electrically insulating part (18) therebetween and joining the shell (14) and the eyelet (16), the shell and the eyelet being electrically conductive, the shell (14) having a tubular portion (14a) with an open end (14b) and a partially closed end (14c) defining a volume (14d) therebetween, the partially closed end (14c) including a tapered area (14e) terminating in a reentrant section (14f) that extends into the volume (14d) and defines an inner annulus (14g). The method of making the base comprises the steps of positioning the shell (14) and the eyelet (16) at a workstation (19) in spaced, axial alignment with one another defining a gap therebetween; actuating a first forming tool (20) through the tubular portion (14a) and into engagement with the tapered area (14e) and the inner annulus (14g); dispensing a quantity of molten glass (32) into the gap; and actuating a second forming tool (22) within the first forming tool20to form the molten glass32into an electrically insulating part18between the shell (14) and the eyelet (16). The base so formed is free from extraneous glass flashing and thereby provides a base less likely to contaminate the lamp manufacturing process.
REFERENCES:
patent: 2993192 (1961-07-01), Mouat
patent: 4003624 (1977-01-01), Smith
patent: 4029387 (1977-06-01), Eager
patent: 4866331 (1989-09-01), Livera
patent: 5568009 (1996-10-01), Gandhi
patent: 6255763 (2001-07-01), Wright
patent: 4219044 (1993-12-01), None
Bupp Neil
Burger Donald
Smith Tad
Unger Jesse
McNeill William H.
Osram Sylvania Inc.
Patel Nimeshkumar D.
Raleigh Donald
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