US3287591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tantalum carbide incandescent lamp and method of manufacture thereof
Assignee: GTE Sylvania Inc
•
Filing: 1961-12-13
•
Granted: 1966-11-22
•
Expires: 1981-12-13
Abstract
No abstract record available.
Inventors
- 👤 Howard B Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:07
CPC Classifications
H; H01; H01K; H01K3/00; H01K3/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A LAMP MOUNT INCLUDING A TANTALUM CARBIDE COIL, A LEG CEMENTED TO EACH END OF SAID COIL AND EXTENDING OUTWARDLY FROM IT, AND A SUPPORT WIRE CEMENTED TO THE OTHERWIRE FREE END OF SAID LEG.
Claim 2
Dependent Claim
35 words
A LAMP MOUNT INCLUDING A TANTALUM CARBIDE COIL, A LEG CEMENTED TO EACH END OF SAID COIL AND EXTENDING OUTWARDLY FROM IT, AND A SUPPORT WIRE CEMENTED TO THE OTHERWIRE FREE END OF SAID LEG.
Claim 3
Independent Claim
90 words
THE METHOD OF MAKING AN ELECTRIC LAMP MOUNT, SAID METHOD COMPRISING FIXING THE ENDS OF A TANTALUM CARBIDE FILAMENT COIL TO OUTWARDLY EXTENDING LEGS BY A CEMENT OF TANTALUM CARBIDE POWDER IN A BINDER, CEMENTING A DIFFERENT PORTION OF SAID LEGS TO FILAMENT SUPPORT WIRES, AND THEN HEATING THE RESULTANT MOUNT AT A TEMPERATURE SUFFICIENT TO CARBURIZE SAID COIL IN AN ATMOSPHERE OF A HYDROCARBON AND HYDROGEN AND TO REMOVE THE BINDER AND SINTER THE CEMENT TO BOND THE COIL TO THE LEGS, AND THE LEGS TO THE SUPPORT WIRES.
Claim 4
Independent Claim
90 words
THE METHOD OF MAKING AN ELECTRIC LAMP MOUNT, SAID METHOD COMPRISING FIXING THE ENDS OF A TANTALUM CARBIDE FILAMENT COIL TO OUTWARDLY EXTENDING LEGS BY A CEMENT OF TANTALUM CARBIDE POWDER IN A BINDER, CEMENTING A DIFFERENT PORTION OF SAID LEGS TO FILAMENT SUPPORT WIRES, AND THEN HEATING THE RESULTANT MOUNT AT A TEMPERATURE SUFFICIENT TO CARBURIZE SAID COIL IN AN ATMOSPHERE OF A HYDROCARBON AND HYDROGEN AND TO REMOVE THE BINDER AND SINTER THE CEMENT TO BOND THE COIL TO THE LEGS, AND THE LEGS TO THE SUPPORT WIRES.
References Cited (Backward Citations)
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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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |