US2657338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting control system
Assignee: Duro Test Corp
•
Filing: 1950-08-15
•
Granted: 1953-10-27
•
Expires: 1970-08-15
Abstract
No abstract record available.
Inventors
- 👤 Williams Rollo Gillespie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:56
CPC Classifications
H; H05; H05B; H05B47/00; H05B47/10; H05B47/155; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1433710A
Cited
US1731772A
Cited
US1945635A
Cited
US1772606A
Cited
GB409711A
Cited
GB411868A
Cited
GB441461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |