USRE28199E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optical device having variable optical density
Assignee: —
•
Filing: 1973-06-01
•
Granted: 1974-10-15
•
Expires: 1993-06-01
Abstract
Abstract 1. A DEVICE HAVING AN ELECTRIC FIELD RESPONSIVE RADIATION TRANSMITTING CHARACTERISTIC COMPRISING A SOLID PERSISTENT ELECTROCHROMIC MATERIAL AND A CURRENT CARRIER PERMEABLE INSULATOR.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:39
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1524; G02F1/1525; G02F1/153; G02F1/155; G02F1/1533; G02F2001/1536
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |