Patent US2914985A successfully refreshed from Google Patents.
US2914985A
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US
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Slide changer and shutter for stereoscopic projectors
Assignee: Bell and Howell Co
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Filing: 1955-05-03
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Granted: 1959-12-01
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Expires: 1975-05-03
Abstract
No abstract record available.
Inventors
- 👤 Frank C Badalich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:15
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189323670A
Cited
US720099A
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US786883A
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US1035872A
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US2122649A
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US2213779A
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US2364788A
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US2634653A
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US2808759A
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US2808760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |