US4676814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the continuous building of a hollow cylindrical soot body having no internal support
Assignee: Heraeus Quarzglas GmbH and Co KG
•
Filing: 1986-05-21
•
Granted: 1987-06-30
•
Expires: 2006-05-21
Abstract
Abstract Disclosed is a method for the axial building up, in a vertical arrangement, of a hollow cylindrical soot body having no internal support and consisting substantially of silicon dioxide by means of at least one flame hydrolysis build-up burner serving for the soot production. In this method the soot is deposited at the beginning of the build-up onto an auxiliary body, and during the build-up the build-up burner and the growing soot body are rotated relative to one another, and the burner is at the same time held at an unvarying distance from the growing end of the hollow cylinder and centrally above the predetermined cross section of the upwardly growing end of the cylinder wall. The penetration of soot into the interior of the cylinder is prevented by means of a directed gas stream.
Inventors
- 👤 Dieter Ross
- 👤 Hans-Ulrich Bonewitz
- 👤 Uwe Christiansen
- 👤 Karl-Friedrich Klein
- 👤 Albert Muhlich
- 👤 Karlheinz Rau
- 👤 Wolfgang Ruffing
- 👤 Fritz Simmat
- 👤 Anton Steinkohl
- 👤 Ralf Takke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:23
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/01413; C03B37/0142; C03B19/00; C03B19/14; C03B19/1415; C03B19/1423; C03B19/1476; C03B19/1484; C03B19/1492; C03B37/0148; C03B37/01486; C03B37/01493; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/40; C23C16/401; C23C16/402; C23C16/44; C23C16/453; C03B2201/00; C03B2201/06; C03B2201/08; C03B2201/12; C03B2201/20; C03B2201/28; C03B2201/30; C03B2201/31; C03B2201/32; C03B2201/40; C03B2201/42; C03B2203/00; C03B2203/10; C03B2203/22; C03B2203/26; C03B2207/00; C03B2207/46; C03B2207/50; C03B2207/54; C03B2207/60; C03B2207/62; C03B2207/64; C03B2207/66
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
121 words
A method for producing a hollow cylindrical soot body having an axial cavity comprising: generating soot by a flame hydrolysis build-up burner, said soot consisting substantially of silicon dioxide; depositing said soot on an auxiliary body to build up said soot body in a vertical arrangement without a support internal to said soot body and form a build-up end of said soot body, said build-up end having a predetermined cross section; rotating said auxiliary body relative to said flame hydrolysis build-up burner; maintaining said build-up burner at a substantially constant distance from said build-up end and centrally with respect to the cross section of said build-up end; and preventing penetration of soot into said axial cavity by a directed gas stream.
Claim 2
Independent Claim
121 words
A method for producing a hollow cylindrical soot body having an axial cavity comprising: generating soot by a flame hydrolysis build-up burner, said soot consisting substantially of silicon dioxide; depositing said soot on an auxiliary body to build up said soot body in a vertical arrangement without a support internal to said soot body and form a build-up end of said soot body, said build-up end having a predetermined cross section; rotating said auxiliary body relative to said flame hydrolysis build-up burner; maintaining said build-up burner at a substantially constant distance from said build-up end and centrally with respect to the cross section of said build-up end; and preventing penetration of soot into said axial cavity by a directed gas stream.
Claim 3
Dependent Claim
32 words
The method of claim 1, wherein the gas stream preventing the penetration of soot into the axial cylinder cavity is obtained with a secondary burner which is disposed in the cylinder cavity.
Claim 4
Dependent Claim
29 words
The method of claim 1, wherein the cylinder build-up is performed with a plurality of build-up burners, said build-up burners disposed and distributed over the cylinder wall cross section.
Claim 5
Dependent Claim
18 words
The method of claim 3, wherein doped soot is deposited with at least one of the build-up burners.
Claim 6
Dependent Claim
36 words
The method of claim 1, wherein at least one build-up burner is held such that the axis of its flame cone encloses with the plane perpendicular to the cylinder axis an angle of 10° to 50°.
Claim 7
Dependent Claim
18 words
The method of claim 5, wherein the build-up burner is held at an angle of 25° to 30°.
Claim 8
Dependent Claim
19 words
The method of claim 1, wherein a gas stream is maintained at the outer circumference of the soot body.
Claim 9
Dependent Claim
23 words
The method of claim 7, wherein a gas stream at the outer circumference of the cylinder is produced with an additional secondary burner.
Claim 10
Dependent Claim
26 words
The method of claim 1, wherein the flame cone of each secondary burner is aimed at an angle in the build-up direction against the cylinder wall.
Claim 11
Dependent Claim
17 words
The method of claim 1, wherein the secondary burner is operated as a build-up or doping burner.
Claim 12
Dependent Claim
11 words
The method of claim 1, wherein the auxiliary body is rotated.
Claim 13
Dependent Claim
35 words
The method of claim 1, wherein the auxiliary body has an annular rim adapted to the cross section of the hollow cylinder that is to be built up, on which rim the soot is deposited.
Claim 14
Independent Claim
130 words
A method for producing a hollow cylindrical soot body having an axial cavity and a cylindrical length of at least 2000 mm comprising: generating soot by a flame hydrolysis build-up burner, said soot consisting substantially of silicon dioxide; depositing said soot on an auxiliary body to build up said soot body in a vertical arrangement without a support internal to said soot body and form a build-up end of said soot body, said build-up end having a predetermined cross section; rotating said auxiliary body relative to said flame hydrolysis build-up burner; maintaining said build-up burner at a substantially constant distance from said build-up end and centrally with respect to the cross section of said build-up end; and preventing penetration of soot into said axial cavity by a directed gas stream.
Claim 15
Independent Claim
130 words
A method for producing a hollow cylindrical soot body having an axial cavity and a cylindrical length of at least 2000 mm comprising: generating soot by a flame hydrolysis build-up burner, said soot consisting substantially of silicon dioxide; depositing said soot on an auxiliary body to build up said soot body in a vertical arrangement without a support internal to said soot body and form a build-up end of said soot body, said build-up end having a predetermined cross section; rotating said auxiliary body relative to said flame hydrolysis build-up burner; maintaining said build-up burner at a substantially constant distance from said build-up end and centrally with respect to the cross section of said build-up end; and preventing penetration of soot into said axial cavity by a directed gas stream.
References Cited (Backward Citations)
JPS5319036A
Cited
JPS5346315A
Cited
JPS5346316A
Cited
JPS547355A
Cited
US4421539A
Cited
JPS5930658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |