US3244493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for making homogeneous gas-free optical glass
Assignee: Bausch and Lomb Inc
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Filing: 1951-05-09
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Granted: 1966-04-05
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Expires: 1971-05-09
Abstract
No abstract record available.
Inventors
- 👤 Charles F Cala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:29
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/18; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
THE PROCESS OF PREPARING A HOMOGENOUS PLATE OR LENS OF GLASS FOR OPTICAL PURPOSES WHICH CONSISTS IN LEADING SUCCESSIVE GLASS MELTS FROM A MELTING FURNACE THROUGH AN EXTENDED REFINING PASSAGEWAY WITH ATTENUATED SUPERFICIAL AREA AT APPROXIMATELY FURNACE TEMPERATURE FOR DEGASIFICATION, CONTINUOUSLY DRAWING OFF THE MELTS FROM THE PASSAGEWAY, STIRRING EACH MELT AND CONVEYING IT INTO AN ACCUMULATING RESERVOIR HAVING A TEMPERATURE LOWER THAN THE MELTING FURNACE, COLLECTING THE SUCCESSIVE MELTS IN THE RESERVOIR, STIRRING THE MELTS SO CLLECTED UNTIL THE MASS IS HOMOGENOUS AND DRAINING THE ENTIRE MASS INTO A MOLD AS A UNITARY BATCH.
Claim 2
Dependent Claim
95 words
THE PROCESS OF PREPARING A HOMOGENOUS PLATE OR LENS OF GLASS FOR OPTICAL PURPOSES WHICH CONSISTS IN LEADING SUCCESSIVE GLASS MELTS FROM A MELTING FURNACE THROUGH AN EXTENDED REFINING PASSAGEWAY WITH ATTENUATED SUPERFICIAL AREA AT APPROXIMATELY FURNACE TEMPERATURE FOR DEGASIFICATION, CONTINUOUSLY DRAWING OFF THE MELTS FROM THE PASSAGEWAY, STIRRING EACH MELT AND CONVEYING IT INTO AN ACCUMULATING RESERVOIR HAVING A TEMPERATURE LOWER THAN THE MELTING FURNACE, COLLECTING THE SUCCESSIVE MELTS IN THE RESERVOIR, STIRRING THE MELTS SO CLLECTED UNTIL THE MASS IS HOMOGENOUS AND DRAINING THE ENTIRE MASS INTO A MOLD AS A UNITARY BATCH.
Claim 3
Dependent Claim
74 words
APPARATUS FOR PREPARING GLASS FOR OPTICAL PURPOSES WHICH COMPRISES A MELTING FURNACE, A REFINING FURNACE HAVING AN EXTENDED PASSAGEWAY WITH ATTENUATED SUPERFICIAL AREA, A DISCHARGE DUCT FROM THE MELTING FURNACE TO THE REFINING FURNACE, A RESERVOIR, A DUCT FROM THE THE REFINING FURNACE TO THE RESERVOIR, A STIRRER IN SAID LAST MENTIONED DUCT, A STIRRER IN THE RESERVOIR, A CASTING DISCHARGE DUCT FROM THE RESERVOIR AND A STIRRER IN SAID LAST MENTIONED DISCHARGE DUCT.
Claim 4
Dependent Claim
74 words
APPARATUS FOR PREPARING GLASS FOR OPTICAL PURPOSES WHICH COMPRISES A MELTING FURNACE, A REFINING FURNACE HAVING AN EXTENDED PASSAGEWAY WITH ATTENUATED SUPERFICIAL AREA, A DISCHARGE DUCT FROM THE MELTING FURNACE TO THE REFINING FURNACE, A RESERVOIR, A DUCT FROM THE THE REFINING FURNACE TO THE RESERVOIR, A STIRRER IN SAID LAST MENTIONED DUCT, A STIRRER IN THE RESERVOIR, A CASTING DISCHARGE DUCT FROM THE RESERVOIR AND A STIRRER IN SAID LAST MENTIONED DISCHARGE DUCT.
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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |