US3742107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion process for optical fibres
Assignee: Poly-Optical Products Inc
•
Filing: 1969-10-06
•
Granted: 1973-06-26
•
Expires: 1989-10-06
Abstract
Abstract An extrusion method for organic polymer optical fibres in which an elongate, solid body of organic polymer material is moved through a crosshead die wherein organic polymer material is extruded to intimately adhere to the surface of the body, and the clad body is then drawn to an increased length. At all times from adherence of the cladding material to the drawing step, the clad body is maintained at a temperature at or above the softening point of the cladding material or the body material.
Inventors
- 👤 J Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:18
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/15; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
The invention according to claim 1 in which said cladding material is polymethylmethacrylate.
Claim 2
Dependent Claim
17 words
The invention of claim 2 in which said sheath material is polystyrene, polymethylmethacrylate, or a mixture thereof.
Claim 3
Dependent Claim
18 words
The invention according to claim 1 in which said maintenance temperature is between about 140*F and about 180*F.
Claim 4
Dependent Claim
19 words
The invention according to claim 1 including incorporating a dye or pigment in said sheath to impart color thereto.
Claim 5
Independent Claim
149 words
A method for making an organic polymer optical monofilament fibre, comprising: providing an elongate solid core, substantially thicker than an optical fibre, of polystyrene, said core being capable of being drawn to an optical fibre; disposing said solid core in operative association with an extruder and extruding around said solid core a cladding of heat-softenable organic polymer material which is capable of being drawn for intimate adherence of said cladding to said core to form a boule thereof, said cladding material having an index of refraction sufficiently lower than the index of refraction of said core material, to reflect light internally; separating said boule from said extruder; thereafter drawing said boule to an increased length to form said optical fibre; and at all times from adherence of said cladding material to said drawing of said boule, maintaining said boule within the temperature range of about 140*F to about 270*F.
References Cited (Backward Citations)
US2313296A
Cited
US2980957A
Cited
US2992517A
Cited
US3214805A
Cited
US3404432A
Cited
US3291584A
Cited
US3394213A
Cited
US3444031A
Cited
US3402427A
Cited
US3485912A
Cited
US3472921A
Cited
US3479425A
Cited
US3487504A
Cited
US3481390A
Cited
US3458615A
Cited
US3556635A
Cited
US3540452A
Cited
US3509248A
Cited
US3557403A
Cited
US3551280A
Cited
US3646186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |