US1419901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device to obtain stereoscopic effects in cinematographic projections
Assignee: Individual
•
Filing: 1920-01-21
•
Granted: 1922-06-13
•
Expires: 1940-01-21
Abstract
No abstract record available.
Inventors
- 👤 Lehnhoff-Wyld Frederic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:59
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60
Claims Analysis
Total Claims: 0
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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) | 1925-06-12 | 1925-12-12 | 1926-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-06-12 | 1929-12-12 | 1930-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-06-12 | 1933-12-12 | 1934-06-13 | $7700.00 | Window Closed / Lapsed |