US2983900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New sono-optical viewing system
Assignee: Individual
•
Filing: 1955-04-19
•
Granted: 1961-05-09
•
Expires: 1975-04-19
Abstract
No abstract record available.
Inventors
- 👤 Devol Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:24
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/52; G01S7/56; G01S7/62; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |