US1729163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminated color changer for spot and flood lights
Assignee: Individual
•
Filing: 1927-06-29
•
Granted: 1929-09-24
•
Expires: 1947-06-29
Abstract
No abstract record available.
Inventors
- 👤 Drew Willis Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:26
CPC Classifications
F; F21; F21S; F21S10/00; F21S10/02; F21V; F21V17/00; F21V17/02
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) | 1932-09-23 | 1933-03-25 | 1933-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-09-23 | 1937-03-25 | 1937-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-09-23 | 1941-03-25 | 1941-09-24 | $7700.00 | Window Closed / Lapsed |