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US2811077A
Expired / Lapsed
US
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Stereo projection apparatus
Assignee: POLA LUX GES fur BLENDSCHUTZ U
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Filing: 1952-08-13
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Granted: 1957-10-29
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Expires: 1972-08-13
Abstract
No abstract record available.
Inventors
- 👤 Wiemer Kurt Franz Gustav
- 👤 Wiemer Paul Eduard August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:14
CPC Classifications
G; G03; G03B; G03B35/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2106752A
Cited
GB519488A
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US2241041A
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US2403731A
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US2476014A
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US2437061A
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US2449287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |