ROBERT A JENKINS
Broker in Acton, MA
License number
Massachusetts 114745
Issued Date
Oct 1, 1979
Expiration Date
Jan 31, 1990
Type
Broker
Address
Address
Acton, MA 01720
Professional information
Method For Reducing Striations In Fused Silica
US Patent:
4523939, Jun 18, 1985
Filed:
Jan 9, 1984
Appl. No.:
6/568517
Inventors:
Robert G. Jenkins - Acton MA
Dennis B. Shinn - Topsfield MA
Dennis B. Shinn - Topsfield MA
Assignee:
GTE Products Corporation - Stamford CT
International Classification:
C03B 2000
US Classification:
65 32
Abstract:
An improved method for melting silica material in a crucible and drawing off a fused silica tube therefrom having reduced air lines or striations. Bubble formation in the silica melt in the crucible is considerably reduced by supplying the exterior of the crucible with an atmosphere of hydrogen in a carrier gas of argon or certain other noble gases. The fused silica melt is discharged from the crucible around a hollow mandrel and a gas mixture of hydrogen in argon is fed within the hollow mandrel to the interior of the issuing silica tubing while the above atmosphere of hydrogen in argon is passed over the exterior of such silica tubing to form a silica tube product with markedly reduced striations.