US3320114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for lowering index of refraction of glass surfaces
Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1963-07-31
•
Granted: 1967-05-16
•
Expires: 1983-07-31
Abstract
No abstract record available.
Inventors
- 👤 Werner P Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:34
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C03C25/1061; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/298
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
106 words
A METHOD FOR PREPARING AN OPTICAL FIBER WHICH COMPRISES TREATING A SUBSTANTIALLY PRE FUSED SILICA FIBER HAVING A THICKNESS FROM ABOUT 250,000 TO 750,000 ANGSTROM UNITS WITH AN AQUEOUS CHLORIDE SOLUTION SELECTED FROM THE GROUP OF ALKALI AND EARTH ALKALI CHLORIDES IN ADMIXTURE WITH A WETTING AGENT, DRYING THE TREATED FIBER TO FORM A CHLORIDE COATING ON THE FIBER SURFACE, AND FIRING THE COATED FIBER AT A TEMPERATURE SUFFICIENT TO CAUSE IN SITU REACTION OF THE CHLORIDE COATING WITH THE PURE SILICA FIBER TO A DEPTH OF ABOUT 3,000 TO 4,000 ANGSTROM FOR PRODUCING A GLASS LAYER HAVING AN INDEX OF REFRACTION DIFFERENT FROM PURE SILICA.
Claim 2
Independent Claim
106 words
A METHOD FOR PREPARING AN OPTICAL FIBER WHICH COMPRISES TREATING A SUBSTANTIALLY PRE FUSED SILICA FIBER HAVING A THICKNESS FROM ABOUT 250,000 TO 750,000 ANGSTROM UNITS WITH AN AQUEOUS CHLORIDE SOLUTION SELECTED FROM THE GROUP OF ALKALI AND EARTH ALKALI CHLORIDES IN ADMIXTURE WITH A WETTING AGENT, DRYING THE TREATED FIBER TO FORM A CHLORIDE COATING ON THE FIBER SURFACE, AND FIRING THE COATED FIBER AT A TEMPERATURE SUFFICIENT TO CAUSE IN SITU REACTION OF THE CHLORIDE COATING WITH THE PURE SILICA FIBER TO A DEPTH OF ABOUT 3,000 TO 4,000 ANGSTROM FOR PRODUCING A GLASS LAYER HAVING AN INDEX OF REFRACTION DIFFERENT FROM PURE SILICA.
Claim 3
Dependent Claim
14 words
AN OPTICAL FIBER PREPARED IN ACCORDANCE WITH THE METHOD SET FORTH IN CLAIM 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |