US3451877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Articles for creating unidirectional vision effects
Assignee: NATHAN B HERSCHMAN
•
Filing: 1965-09-07
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Granted: 1969-06-24
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Expires: 1985-09-07
Abstract
No abstract record available.
Inventors
- 👤 Nathan B Herschman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:13
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/54; B; B44; B44F; B44F1/00; B44F1/06; B44F1/066; G; G09; G09F; G09F13/00; G09F13/04; G09F13/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24802; Y10T428/24851; Y10T428/24868
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) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |