Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1984-12-06
1986-04-15
Lindsay, Robert
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65110, 65156, 65282, 65295, C03B 2704
Patent
active
045825238
ABSTRACT:
A method for manufacturing a fluorescent lamp envelope of substantially round configuration in cross-section and having a plurality of constricting portions axially spaced apart and extending substantially about the circular periphery of the envelope and projecting therein. The method comprises the steps of providing an envelope having a predetermined length and axially opposed end portions, providing a plurality of heat sources, providing relative rotation between the envelope and the plurality of heat sources, providing a means for engaging the envelope and for forming the plurality of constricting portions, moving the forming means to engage the envelope and applying a positive pressure within the envelope while the forming means is engaged with the envelope.
REFERENCES:
patent: 2916645 (1959-12-01), Lemmers et al.
patent: 2973447 (1961-02-01), Aicher et al.
patent: 3098945 (1963-07-01), Lemmers
patent: 3759682 (1973-09-01), Tiley
patent: 3897233 (1975-07-01), Szligali
patent: 3988633 (1976-10-01), Shurgan
patent: 4514206 (1985-04-01), Roselt et al.
Marcucci Rudolph V.
Pai Robert Y.
Bessone Carlo S.
GTE Products Corporation
Lindsay Robert
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