Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1988-06-08
1989-09-26
Ramsey, Kenneth J.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65109, 65279, C03B 3308
Patent
active
048697443
ABSTRACT:
Method of manufacturing an electric lamp having a glass tubular part (101) with a longitudinal axis, which part is sealed by a sealing member in which firstly a constriction with a collar (105) is formed by means of heating at one end of the tubular part whereafter the sealing member is secured in a gas-tight manner. The constriction in the tubular part is provided at some distance from the end whereafter in the same fixture the tubular part is divided by means of fusing at the area of the constriction and the two wall portions located on either side of the constriction are moved apart in the axial direction.
REFERENCES:
patent: 2764847 (1956-10-01), Buell
patent: 3207590 (1965-09-01), Corbeek
patent: 3880637 (1975-04-01), Dichter
patent: 3897233 (1975-07-01), Szilagyi
patent: 4629437 (1986-12-01), Roche
Ramsey Kenneth J.
U.S. Philips Corporation
Wieghaus Brian J.
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