Electric heating – Microwave heating – Tunnel furnace
Patent
1978-02-13
1981-06-16
Lazarus, Richard B.
Electric heating
Microwave heating
Tunnel furnace
65108, 65112, 65270, 219121LC, 219121LG, H01J 938, H01J 940
Patent
active
042733987
ABSTRACT:
A unique method and apparatus for manufacturing gas-filled tubes utilizes an optically-spread beam of light to seal and cut short segments of tubing from a long tube containing the gas. Neither the laser beam nor the tubing is moved during the cutting and sealing operation. The gas being supplied to the length of tubing during the cutting and sealing operation is maintained at constant pressure so that each cut segment has the same resultant internal gas pressure. In one embodiment, radioactive light sources for illuminating displays and the like are manufactured by indexing a long phosphor-coated glass tube containing radioactive gas maintained at constant pressure, past a laser which generates an optically-spread light beam. The laser is activated in each index position of the tube to seal and cut short segments of the tubing with each segment having the same quantity of radioactive gas to provide the same desired quantity of illumination.
REFERENCES:
patent: 3628846 (1971-12-01), Cortorillo
patent: 3943324 (1976-03-01), Haggerty
patent: 4044936 (1977-08-01), Obersby
patent: 4045201 (1977-08-01), Caffarella et al.
patent: 4082392 (1978-04-01), Golin
patent: 4146380 (1979-03-01), Caffarella et al.
Summers Tommy L.
Yenawine David L.
Heiting Leo N.
Lazarus Richard B.
Merrett N. Rhys
Sharp Melvin S.
Texas Instruments Incorporated
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