US3254320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heaters
Assignee: Babcock and Wilcox Co
•
Filing: 1963-08-15
•
Granted: 1966-05-31
•
Expires: 1983-08-15
Abstract
No abstract record available.
Inventors
- 👤 John F Hill
- 👤 Dean L Mayer
- 👤 Hughes Thomas Alvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:00
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/02; H05B3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
AN ELECTRIC HEATER COMPRISING A SUBSTANTIALLY IMPERFORATE TUBULAR ELECTRIC RESISTANCE ELEMENT, A TUBULAR COVERING SHEATH COAXIALLY ENCLOSING SAID TUBULAR RESISTANCE ELEMENT, A THIN DENSE AND UNIFORM FILM OF DIELECTRIC MATERIAL DISPOSED BETWEEN SAID RESISTANCE ELEMENT AND SAID COVERING SHEATH, A LOW RESISTANCE CONDUCTOR ROD DISPOSED COAXIALLY WITHIN SAID RESISTANCE ELEMENT AND HAVING ONE END ARRANGED AT ONE END OF SAID RESISTANCE ELEMENT, SAID CONDUCTOR ROD EXTENDING THROUGH SAID RESISTANCE ELEMENT TO THE OPPOSITE END THEREOF, A CONNECTING MEMBER HAVING AN OUTER DIMENSION LESS THAN THE INNER DIAMETER OF SAID COVERING SHEATH CONNECTING SAID ONE ENDS OF SAID CONDUCTOR ROD AND SAID RESISTANCE ELEMENT, AN END PLUG ARRANGED TO BE AXIALLY SPACED FROM SAID CONNECTING MEMBER AND SEALINGLY CLOSING THE END OF SAID COVERING SHEATH, MEANS CONNECTING THE ENDS OF SAID CONDUCTOR ROD AND SAID RESISTANCE ELEMENT OPPOSITE SAID CONNECTED END TO A SOURCE OF ELECTRIC POWER, AND AN ELECTRIC INSULATING MATERIAL DISPOSED BETWEEN SAID CONDUCTOR ROD AND SAID RESISTANCE ELEMENT.
Claim 2
Dependent Claim
160 words
AN ELECTRIC HEATER COMPRISING A SUBSTANTIALLY IMPERFORATE TUBULAR ELECTRIC RESISTANCE ELEMENT, A TUBULAR COVERING SHEATH COAXIALLY ENCLOSING SAID TUBULAR RESISTANCE ELEMENT, A THIN DENSE AND UNIFORM FILM OF DIELECTRIC MATERIAL DISPOSED BETWEEN SAID RESISTANCE ELEMENT AND SAID COVERING SHEATH, A LOW RESISTANCE CONDUCTOR ROD DISPOSED COAXIALLY WITHIN SAID RESISTANCE ELEMENT AND HAVING ONE END ARRANGED AT ONE END OF SAID RESISTANCE ELEMENT, SAID CONDUCTOR ROD EXTENDING THROUGH SAID RESISTANCE ELEMENT TO THE OPPOSITE END THEREOF, A CONNECTING MEMBER HAVING AN OUTER DIMENSION LESS THAN THE INNER DIAMETER OF SAID COVERING SHEATH CONNECTING SAID ONE ENDS OF SAID CONDUCTOR ROD AND SAID RESISTANCE ELEMENT, AN END PLUG ARRANGED TO BE AXIALLY SPACED FROM SAID CONNECTING MEMBER AND SEALINGLY CLOSING THE END OF SAID COVERING SHEATH, MEANS CONNECTING THE ENDS OF SAID CONDUCTOR ROD AND SAID RESISTANCE ELEMENT OPPOSITE SAID CONNECTED END TO A SOURCE OF ELECTRIC POWER, AND AN ELECTRIC INSULATING MATERIAL DISPOSED BETWEEN SAID CONDUCTOR ROD AND SAID RESISTANCE ELEMENT.
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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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |