Patent US1951733A successfully refreshed from Google Patents.
US212860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in electric lights
Assignee: —
•
Filing: —
•
Granted: 1879-03-04
•
Expires: 1896-03-04
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:59
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958
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) | 1882-03-03 | 1882-09-02 | 1883-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1886-03-03 | 1886-09-02 | 1887-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1890-03-03 | 1890-09-02 | 1891-03-04 | $7700.00 | Window Closed / Lapsed |