US2679188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depth illusion attachment device for optical projectors
Assignee: Individual
•
Filing: 1949-08-30
•
Granted: 1954-05-25
•
Expires: 1969-08-30
Abstract
No abstract record available.
Inventors
- 👤 Gould Leigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:38
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)
US817569A
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US1003064A
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US1154232A
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GB191204480A
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US1271667A
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US1370885A
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US1438013A
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US1627892A
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US1833634A
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US1787808A
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US1848253A
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US2029300A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |