Patent US3330637A successfully refreshed from Google Patents.
US3330637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing impurities in a molten metal bath for glass sheet making
Assignee: Pilkington Group Ltd
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Filing: 1964-08-17
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Granted: 1967-07-11
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Expires: 1984-08-17
Abstract
No abstract record available.
Inventors
- 👤 Loukes David Gordon
- 👤 Edwards Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:25
CPC Classifications
C; C03; C03B; C03B18/00; C03B18/02; C03B18/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN THE MANUFACTURE OF FLAT GLASS DURING WHICH THE GLASS IS IN CONTACT WITH MOLTEN METAL, CONTINUALLY MAINTAINING IN THE MOLTEN METAL A TRACE CONCENTRATION OF AN ADDITIVE ELEMENT WITH WHICH OXYGEN AND SULPHUR PRESENT IN THE MOLTEN METAL AS IMPURITY REACT IN PREFERENCE TO REACTION WITH THE MOLTEN METAL, AND MAINTAINING IN CONTACT WITH A ZONE OF THE MOLTEN METAL A MOLTEN LAYER AT LEAST PARTIALLY COMPRISING A MEMBER OF THE GROUP CONSISTING OF FLUORIDES AND CHLORIDES OF SAID ADDITIVE ELEMENT, WHICH MOLTEN LAYER TAKES UP FROM THE MOLTEN METAL A PRODUCT OF REACTION OF SAID ADDITIVE ELEMENT WITH ANY SAID IMPURITY IN THE MOLTEN METAL.
Claim 2
Dependent Claim
107 words
IN THE MANUFACTURE OF FLAT GLASS DURING WHICH THE GLASS IS IN CONTACT WITH MOLTEN METAL, CONTINUALLY MAINTAINING IN THE MOLTEN METAL A TRACE CONCENTRATION OF AN ADDITIVE ELEMENT WITH WHICH OXYGEN AND SULPHUR PRESENT IN THE MOLTEN METAL AS IMPURITY REACT IN PREFERENCE TO REACTION WITH THE MOLTEN METAL, AND MAINTAINING IN CONTACT WITH A ZONE OF THE MOLTEN METAL A MOLTEN LAYER AT LEAST PARTIALLY COMPRISING A MEMBER OF THE GROUP CONSISTING OF FLUORIDES AND CHLORIDES OF SAID ADDITIVE ELEMENT, WHICH MOLTEN LAYER TAKES UP FROM THE MOLTEN METAL A PRODUCT OF REACTION OF SAID ADDITIVE ELEMENT WITH ANY SAID IMPURITY IN THE MOLTEN METAL.
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) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |