US2432104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System of light modulation
Assignee: PHOTOSWITCH Inc
•
Filing: 1945-03-10
•
Granted: 1947-12-09
•
Expires: 1965-03-10
Abstract
No abstract record available.
Inventors
- 👤 Thomson Elihu Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/04; H05B39/08; H05B39/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2028338A
Cited
US2012573A
Cited
US2144337A
Cited
FR820866A
Cited
US2265784A
Cited
US2254022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-08 | 1951-06-09 | 1951-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-08 | 1955-06-09 | 1955-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-08 | 1959-06-09 | 1959-12-09 | $7700.00 | Window Closed / Lapsed |