US2623433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereoscopic projection system, including anaglyphic and polarizing filters
Assignee: Individual
•
Filing: 1948-09-21
•
Granted: 1952-12-30
•
Expires: 1968-09-21
Abstract
No abstract record available.
Inventors
- 👤 Stipek Johann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
G; G03; G03B; G03B35/00; G03B35/18; G03B35/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1806864A
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FR874243A
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US2063004A
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US2053689A
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US2132904A
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US2210806A
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US2218875A
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US2283466A
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US2309879A
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US2289714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |