US2790924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filament structure
Assignee: Machlett Laboratories Inc
•
Filing: 1953-07-28
•
Granted: 1957-04-30
•
Expires: 1973-07-28
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Skehan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:11
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15; H01J1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US708432A
Cited
US1928202A
Cited
US1936762A
Cited
US1884957A
Cited
US2414501A
Cited
US2442141A
Cited
US2397854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |