Patent US3206291A successfully refreshed from Google Patents.
US3206291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining glass
Assignee: Individual
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Filing: 1961-09-11
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Granted: 1965-09-14
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Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Harvey L Penberthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:24
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/18; C03B5/193
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A PROCESS OF MAKING GLASS IN A GLASS FURNACE WHICH CONTAINS AT LEAST ONE BUBBLER TUBE EXTENDING UPWARDLY FROM THE FLOOR OF THE FURNACE INTO THE MOLTEN FURNACE CHARGE, A METHOD OF MAINTAINING SUBSTANTIALLY CONSTANT THE HEIGHT OF SAID BUBBLE TUBE AOVE SAID FURNACE FLOOR NOTWITHSTANDING EROSION OF SAID TUBE BY SAID CHARGE, COMPRISING: PERMITTING A GIVEN GAS FLOW RATE THROUGH SAID TUBE WITH THE TUBE AT A GIVEN TUBE HEIGHT SO AS TO PROVIDE A BACK-PRESSURE DATUM INDICATED ON A PRESSURE INDICATING MEANS ASSOCIATED WITH SAID TUBE; AND SUBSEQUENTLY UPON EROSION OF SAID TUBE ADJUSTING THE HEIGHT OF SAID TUBE ABOVE SAID FURANCE FLOOR TO RESTORE THE BACK-
Claim 2
Dependent Claim
110 words
IN A PROCESS OF MAKING GLASS IN A GLASS FURNACE WHICH CONTAINS AT LEAST ONE BUBBLER TUBE EXTENDING UPWARDLY FROM THE FLOOR OF THE FURNACE INTO THE MOLTEN FURNACE CHARGE, A METHOD OF MAINTAINING SUBSTANTIALLY CONSTANT THE HEIGHT OF SAID BUBBLE TUBE AOVE SAID FURNACE FLOOR NOTWITHSTANDING EROSION OF SAID TUBE BY SAID CHARGE, COMPRISING: PERMITTING A GIVEN GAS FLOW RATE THROUGH SAID TUBE WITH THE TUBE AT A GIVEN TUBE HEIGHT SO AS TO PROVIDE A BACK-PRESSURE DATUM INDICATED ON A PRESSURE INDICATING MEANS ASSOCIATED WITH SAID TUBE; AND SUBSEQUENTLY UPON EROSION OF SAID TUBE ADJUSTING THE HEIGHT OF SAID TUBE ABOVE SAID FURANCE FLOOR TO RESTORE THE BACK-
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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |