Patent US3899313A successfully refreshed from Google Patents.
US3899313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a light conducting fiber having a core and a casing
Assignee: Siemens AG
•
Filing: 1973-06-27
•
Granted: 1975-08-12
•
Expires: 1993-06-27
Abstract
Abstract A glass fiber having a central core formed of material having a relatively high index of refraction and an outer casing formed of material having a relatively low index of refraction is formed with perfect contact between the core and casing by forming a coating of casing material on the core and permitting the coating to harden. The coating may be applied by immersing the core material in a bath of casing material, by drawing the core material vertically through a bath of the casing material, or by drawing the core material in a horizontal direction under a vertical column of casing material while twisting said core material.
Inventors
- 👤 Josef Grabmaier
- 👤 Rolf Plaettner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:31
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/01265; C03B37/01277; C03B37/014; C03B37/018; C03B2201/00; C03B2201/02; C03B2201/06; C03B2201/30; C03B2201/40; C03B2201/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD FOR PRODUCING A LIGHT CONDUCTING FIBER CONSISTING OF CORE FORMED OF A QUARTZ GLASS DOPED WITH TIO2 AND A SURROUNDING CASING FORMED OF RELATIVELY PURE QUARTZ GLASS, WHEREBY THE REFRACTIVE INDEX OF THE CASING IS LOWER THAN THAT OF THE CORE, COMPRISING THE STEPS OF: HEATING THE CORE TO A TEMPERATURE WHICH IS SLIGHTLY BELOW ITS FUSING TEMPERATURE, IMMERSING THE CORE INTO A MELT OF RELATIVELY PURE QUARTZ GLASS, AND WITHDRAWING THE CORE THEREFROM, SAID IMMERSING BEING CARRIED OUT AT A REDUCED PRESSURE RELATIVE TO ATMOSPHERIC PRESSURE, SAID IMMERSION BEING CARRIED OUT BY PULLING SAID CORE BENEATH AND IN CONTACT WITH SAID MELT IN A HORIZONTAL DIRECTION WHILE SIMULTANEOUSLY ROTATING SAID CORE ABOUT ITS LONGITUDINAL AXIS.
Claim 2
Independent Claim
118 words
A METHOD FOR PRODUCING A LIGHT CONDUCTING FIBER CONSISTING OF CORE FORMED OF A QUARTZ GLASS DOPED WITH TIO2 AND A SURROUNDING CASING FORMED OF RELATIVELY PURE QUARTZ GLASS, WHEREBY THE REFRACTIVE INDEX OF THE CASING IS LOWER THAN THAT OF THE CORE, COMPRISING THE STEPS OF: HEATING THE CORE TO A TEMPERATURE WHICH IS SLIGHTLY BELOW ITS FUSING TEMPERATURE, IMMERSING THE CORE INTO A MELT OF RELATIVELY PURE QUARTZ GLASS, AND WITHDRAWING THE CORE THEREFROM, SAID IMMERSING BEING CARRIED OUT AT A REDUCED PRESSURE RELATIVE TO ATMOSPHERIC PRESSURE, SAID IMMERSION BEING CARRIED OUT BY PULLING SAID CORE BENEATH AND IN CONTACT WITH SAID MELT IN A HORIZONTAL DIRECTION WHILE SIMULTANEOUSLY ROTATING SAID CORE ABOUT ITS LONGITUDINAL AXIS.
References Cited (Backward Citations)
US2916347A
Cited
US2976177A
Cited
US3033731A
Cited
US3209641A
Cited
US3726656A
Cited
US3737293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |