Patent US2438181A successfully refreshed from Google Patents.
US2438181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent and/or cathode glow lamp and method
Assignee: Westinghouse Electric Corp
•
Filing: 1943-05-27
•
Granted: 1948-03-23
•
Expires: 1963-05-27
Abstract
No abstract record available.
Inventors
- 👤 Morehead Chalmers
- 👤 Daniel S Gustin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:08
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/70; H01J61/72
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1605001A
Cited
US1636054A
Cited
US1648293A
Cited
GB310895A
Cited
US2304768A
Cited
US1944929A
Cited
US2007936A
Cited
US2020722A
Cited
US2018815A
Cited
GB474907A
Cited
US2341990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |