US2928977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescent lamp
Assignee: General Electric Co
•
Filing: 1958-12-19
•
Granted: 1960-03-15
•
Expires: 1978-12-19
Abstract
No abstract record available.
Inventors
- 👤 Roth Walter
- 👤 Raymond E Grande
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:47
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
AN INCANDESCENT LAMP COMPRISING AN EVACUABLE LIGHT-TRANSMISSIVE ENVELOPE HAVING THEREIN A FILAMENT OF TANTALUM CARBIDE AND A GASEOUS FILLING WHICH UPON THERMAL DECOMPOSITION PRODUCES A PARTIAL PRESSURE OF CYANIDE RADICAL CONTAINING GAS IN THE VICINITY OF SAID FILAMENT WHEN
Claim 2
Dependent Claim
39 words
AN INCANDESCENT LAMP COMPRISING AN EVACUABLE LIGHT-TRANSMISSIVE ENVELOPE HAVING THEREIN A FILAMENT OF TANTALUM CARBIDE AND A GASEOUS FILLING WHICH UPON THERMAL DECOMPOSITION PRODUCES A PARTIAL PRESSURE OF CYANIDE RADICAL CONTAINING GAS IN THE VICINITY OF SAID FILAMENT WHEN
References Cited (Backward Citations)
US2072788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |