US3990873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for pulling light conducting fibers
Assignee: Siemens AG
•
Filing: 1975-07-08
•
Granted: 1976-11-09
•
Expires: 1995-07-08
Abstract
Abstract A process and an apparatus for pulling cladded light conducting fibers from one end of a blank characterized by utilizing a blank having a hollow tubular core with an exterior casing, directing laser radiation, which will be absorbed by the material of the blank, axially along the blank to heat the one end to create a melting zone from which the cladded fiber is pulled. To aid in directing the laser radiation an optical element is mounted on the open end of the tube to move therewith and to aid in concentrating the radiant energy at the melting zone the one end is positioned at a focal point of substantially spherical reflecting surface so that heat radiating therefrom is reflected and concentrated at the melting zone.
Inventors
- 👤 Anton Knetzlstorfer, deceased
- 👤 heir by Christine Knetzlstorfer
- 👤 heir by Hans Knetzlstorfer
- 👤 heir by Erna Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:28
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/029; C03B2205/00; C03B2205/60; C03B2205/62; C03B2205/67
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
In a method of pulling a cladded light conducting fiber from one end of a blank having cylindrical cross section and consisting of a core and a casing by radiantly heating the one end of the blank to form a melting zone in the blank and pulling the fiber from the melting zone, the improvements comprising providing a tubular blank having a hollow tubular core with the casing, said tubular blank having an open end opposite said one end, and applying laser radiation, which is absorbed by the material of the blank, by guiding the laser radiation through the blank to said one end.
Claim 2
Dependent Claim
104 words
In a method of pulling a cladded light conducting fiber from one end of a blank having cylindrical cross section and consisting of a core and a casing by radiantly heating the one end of the blank to form a melting zone in the blank and pulling the fiber from the melting zone, the improvements comprising providing a tubular blank having a hollow tubular core with the casing, said tubular blank having an open end opposite said one end, and applying laser radiation, which is absorbed by the material of the blank, by guiding the laser radiation through the blank to said one end.
Claim 3
Dependent Claim
25 words
In a method according to claim 1, which includes controlling of the temperature at the melting zone by controlling the intensity of the laser radiation.
Claim 4
Dependent Claim
47 words
In a method according to claim 1, which further includes providing a substantially spherical reflector having a focal point, and maintaining said one end at the focal point so that radiant energy given off by the melting zone is reflected back and concentrated at said one end.
Claim 5
Dependent Claim
29 words
In a method according to claim 3, which includes controlling the temperature at the melting zone by shifting said one end relative to the focal point of the reflector.
Claim 6
Dependent Claim
54 words
In a method according to claim 1, wherein the step of applying the laser radiation comprises directing the laser radiation axially along the hollow blank from the open end to said one end, said step of directing including providing an optical element rigidly attached to said open end for axially directing the laser radiation.
Claim 7
Dependent Claim
48 words
In a method according to claim 5, which further includes providing a substantially spherical reflector having a focal point, and positioning said one end of the blank at the focal point so that radiant energy given off by the melting zone is reflected back to said one end.
Claim 8
Dependent Claim
25 words
In a method according to claim 6, which includes controlling of the temperature at the melting zone by controlling the intensity of the laser radiation.
Claim 9
Dependent Claim
37 words
In a method according to claim 7, which further includes controlling the temperature at the melting zone by shifting the optical element and blank to shift the melting zone relative to the focal point of the reflector.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |