Patent US3170979A successfully refreshed from Google Patents.
US3170979A
Expired / Lapsed
US
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Optical image interposing display device
Assignee: Individual
•
Filing: 1962-04-30
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Granted: 1965-02-23
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Expires: 1982-04-30
Abstract
No abstract record available.
Inventors
- 👤 Alan W Baldwin
- 👤 Henry P Birmingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:11
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/017; G02B27/0176; G02B27/0172; G03; G03B; G03B21/00; G02B27/0101; G02B2027/0143; G02B27/0149; G02B2027/0154; G02B2027/0156; G02B2027/0159
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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |