US3754879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a doubly clad glass monofiber element having a lowviscosity outer cladding
Assignee: American Optical Corp
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Filing: 1970-10-29
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Granted: 1973-08-28
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Expires: 1990-10-29
Abstract
Abstract A glass core is assembled in a glass cladding tube and a plurality of rods of low viscosity glass is fused at regular intervals around the outside of the cladding tube. The fusing process occurs at the mono drawing stage. The assembly is drawn through a ring in the drawing furnace immediately subsequent to the point where the cladding tube is collapsed against the core by a vacuum which is drawn between the cladding and core. In this manner, the rods are forced against the cladding tube, thereby fusing the rods on the surface of the cladding.
Inventors
- 👤 R Phaneuf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:08
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/027; C03B37/029
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
147 words
A method of doubly cladding an optical glass core in a single operation comprising the following steps performed in the order shown, telescoping a glass core rod into a tube of cladding glass with an annular space therebetween, positioning a plurality of glass rods having a viscosity lower than that of the cladding glass regularly around the exterior of the cladding tube, progressively heating the assembly of the glass core, annularly spaced glass cladding tube, and plurality of regularly spaced glass rods from end to end to fusion temperature, applying a vacuum to the annular space between the core and the cladding tube during the progressive heating to collapse the cladding onto the core thereby fusing the cladding to the core, mechanically forcing the regularly positioned rods into fusion contact with the progressively heated collapsed cladding tube, and drawing the fused assembly into A doubly clad monofiber.
Claim 2
Independent Claim
147 words
A method of doubly cladding an optical glass core in a single operation comprising the following steps performed in the order shown, telescoping a glass core rod into a tube of cladding glass with an annular space therebetween, positioning a plurality of glass rods having a viscosity lower than that of the cladding glass regularly around the exterior of the cladding tube, progressively heating the assembly of the glass core, annularly spaced glass cladding tube, and plurality of regularly spaced glass rods from end to end to fusion temperature, applying a vacuum to the annular space between the core and the cladding tube during the progressive heating to collapse the cladding onto the core thereby fusing the cladding to the core, mechanically forcing the regularly positioned rods into fusion contact with the progressively heated collapsed cladding tube, and drawing the fused assembly into A doubly clad monofiber.
Claim 3
Dependent Claim
20 words
A method according to claim 1, wherein the glass assembly is positioned vertically and moves continuously downwardly through the steps.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |