Patent US4000454A successfully refreshed from Google Patents.
US2216974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
By-pass for luminous tube systems
Assignee: Individual
•
Filing: 1939-07-29
•
Granted: 1940-10-08
•
Expires: 1959-07-29
Abstract
No abstract record available.
Inventors
- 👤 Robert E Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:06
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/46; H05B41/02; H05B41/04
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) | 1943-10-08 | 1944-04-08 | 1944-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-08 | 1948-04-08 | 1948-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-08 | 1952-04-08 | 1952-10-08 | $7700.00 | Window Closed / Lapsed |