US2608128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phototube amplification
Assignee: W M WELSH MANUFACTURING Co
•
Filing: 1949-03-09
•
Granted: 1952-08-26
•
Expires: 1969-03-09
Abstract
No abstract record available.
Inventors
- 👤 Lawrence C Kelsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:44
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/02; H01J40/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1972221A
Cited
US1976461A
Cited
US2152822A
Cited
US2505316A
Cited
US2526509A
Cited
US2499996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-26 | 1956-02-25 | 1956-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-26 | 1960-02-25 | 1960-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-26 | 1964-02-25 | 1964-08-26 | $7700.00 | Window Closed / Lapsed |