US1643697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting apparatus
Assignee: Individual
•
Filing: 1925-10-29
•
Granted: 1927-09-27
•
Expires: 1945-10-29
Abstract
No abstract record available.
Inventors
- 👤 Frank W Christy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
F; F21; F21V; F21V21/00; F21V21/14; F21S; F21S8/00; F21V17/00; F21V17/06
Claims Analysis
Total Claims: 0
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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) | 1930-09-26 | 1931-03-28 | 1931-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-09-26 | 1935-03-28 | 1935-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-09-26 | 1939-03-28 | 1939-09-27 | $7700.00 | Window Closed / Lapsed |