Patent US4323525A successfully refreshed from Google Patents.
US2702259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of electrodes which are sensitized so as to be emitters of photoelectrons or secondary electrons
Assignee: EMI Ltd
•
Filing: 1951-08-09
•
Granted: 1955-02-15
•
Expires: 1971-08-09
Abstract
No abstract record available.
Inventors
- 👤 Sommer Alfred Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:00
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |