US3069584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making tungsten filaments
Assignee: Individual
•
Filing: 1959-07-29
•
Granted: 1962-12-18
•
Expires: 1979-07-29
Abstract
No abstract record available.
Inventors
- 👤 Jack W Frazer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:08
CPC Classifications
H; H01; H01K; H01K3/00; H01K3/02; C; C23; C23C; C23C16/00; C23C16/06; C23C16/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
IN A FILAMENT FOR HEATING SOLID SAMPLES OF HEAVY ELEMENTS IN MASS SPECTROGRAPHIC DETERMINATIONS, THE COMBINATION COMPRISING A TANTALUM CORE HAVING AN OUTER COATING OF TANTALUM-DIFFUSED TUNGSTEN AT LEAST ONE-HALF MIL THICK
Claim 2
Dependent Claim
32 words
IN A FILAMENT FOR HEATING SOLID SAMPLES OF HEAVY ELEMENTS IN MASS SPECTROGRAPHIC DETERMINATIONS, THE COMBINATION COMPRISING A TANTALUM CORE HAVING AN OUTER COATING OF TANTALUM-DIFFUSED TUNGSTEN AT LEAST ONE-HALF MIL THICK
References Cited (Backward Citations)
US2347501A
Cited
US2438732A
Cited
US2867032A
Cited
US2820920A
Cited
US2827587A
Cited
US2879431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |