US2754346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass melting furnace
Assignee: Individual
•
Filing: 1952-08-08
•
Granted: 1956-07-10
•
Expires: 1972-08-08
Abstract
No abstract record available.
Inventors
- 👤 Steele D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:02
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/02; C03B5/033; C03B5/0336; C03B37/00; C03B37/01; C03B37/06; C03B5/021; C03B5/16; C03B5/20; C03B5/205; C03B5/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
AN ELECTRIC FURNACE COMPRISING A REFRACTORY TUBE HAVING AN UPPER END AND A LOWER END, WITH AN INLET PORT NEAR THE UPPER END AN AN OUTLET COAT NEAR THE LOWER END; A REFRACTORY TERMINAL BLOCK CLOSING EACH END OF THE TUBE; AN ELECTRICAL TERMINAL AT EACH END OF THE TUBE FOR CONNECTION TO AN EXTERNAL ELECTRICAL CIRCUIT TO PERMIT A HEATING CURRENT TO TRAVERSE THE TUBE; MEANS FOR KEEPING THE INLET PORT AND THE PORT REGION COOL ENOUGH TO PREVENT CAKING OF THE SUPPLY MATERIAL TO BE FED INTO THE FURNACE; FIRST INDUCTION HEATING MEANS FOR ADDITIONALLY HEATING THE CONTENTS OF THE TUBE AS THEY APPROACH AND MOVE TO THE OUTLET PORTS AND SECOND MEANS AT
Claim 2
Dependent Claim
116 words
AN ELECTRIC FURNACE COMPRISING A REFRACTORY TUBE HAVING AN UPPER END AND A LOWER END, WITH AN INLET PORT NEAR THE UPPER END AN AN OUTLET COAT NEAR THE LOWER END; A REFRACTORY TERMINAL BLOCK CLOSING EACH END OF THE TUBE; AN ELECTRICAL TERMINAL AT EACH END OF THE TUBE FOR CONNECTION TO AN EXTERNAL ELECTRICAL CIRCUIT TO PERMIT A HEATING CURRENT TO TRAVERSE THE TUBE; MEANS FOR KEEPING THE INLET PORT AND THE PORT REGION COOL ENOUGH TO PREVENT CAKING OF THE SUPPLY MATERIAL TO BE FED INTO THE FURNACE; FIRST INDUCTION HEATING MEANS FOR ADDITIONALLY HEATING THE CONTENTS OF THE TUBE AS THEY APPROACH AND MOVE TO THE OUTLET PORTS AND SECOND MEANS AT
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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) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |