US2457747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron multiplier tube circuits
Assignee: GAF Chemicals Corp
•
Filing: 1946-02-15
•
Granted: 1948-12-28
•
Expires: 1966-02-15
Abstract
No abstract record available.
Inventors
- 👤 Monroe H Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:50
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2139474A
Cited
US2241371A
Cited
US2257942A
Cited
US2342986A
Cited
US2328985A
Cited
US2374248A
Cited
US2389991A
Cited
US2416376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |