US3474248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-dimensional visual display systems
Assignee: National Research Development Corp UK
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Filing: 1965-03-30
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Granted: 1969-10-21
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Expires: 1985-03-30
Abstract
No abstract record available.
Inventors
- 👤 Michael Richard Brown
- 👤 Geoffrey Sherwood Waters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:21
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01D; G01D7/00; G01D7/02; G01D7/08; G01D7/10
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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |