US2091031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing phototubes
Assignee: RCA Corp
•
Filing: 1935-02-28
•
Granted: 1937-08-24
•
Expires: 1955-02-28
Abstract
No abstract record available.
Inventors
- 👤 Boer Jan Hendrik De
- 👤 Teves Marten Cornelis
- 👤 Lems Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:01
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-08-23 | 1941-02-22 | 1941-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-08-23 | 1945-02-22 | 1945-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-08-23 | 1949-02-22 | 1949-08-24 | $7700.00 | Window Closed / Lapsed |