Title: Method of applying protective coating on lamp envelope

Abstract: A method of applying a protective light-transmitting coating on the exterior surface of the glass envelope of a lamp, the method comprising: holding the lamp with its longitudinal axis disposed horizontally and rotating the lamp about its longitudinal axis; flow-dispensing a liquid coating material of a predetermined viscosity onto the rotating lamp envelope from a dispensing means including a profiled row of needles located above the lamp; and allowing the envelope coating to be cure-hardened, such as by irradiation. The method is particularly useful for applying an optically clear photopolymer coating on the glass envelope of a photoflash lamp in less than one second and then curing the coating by irradiation with a source of ultraviolet light.

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Inventors: Leach, Burleigh H. (Hamilton, MA, US)
Tozier, John E. (Williamsport, PA, US)
Casale, Charles C. (Williamsport, PA, US)

Application Number: 031711
Filing Date: 1979-04-20
Publication_date: 1980-04-08
Assignee: GTE Sylvania Incorporated (Stamford, CT)
Primary Class(es): 427/518 427/106, 427/425
Other Classes:
US Patent Ref:

2572515	Oct, 1951	Poole et al.	427/425.
2574686	Nov, 1951	Brown	427/425.
3009209	Nov, 1961	Weinbrenner et al.	427/425.
3258521	Jun, 1966	Francel	427/106.
3953626	Apr, 1976	Suzuki et al.	427/425.
4076489	Feb, 1978	Schroeter et al.	427/54.
4082870	Apr, 1978	Yenni	427/425.

Other Refs:
Primary Examiner: Newsome, John H.
Assistant Examiner:
Attorney: Coleman; Edward J.