US3450468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection system for projecting constant size images from variable size frames
Assignee: Bell and Howell Co
•
Filing: 1966-06-16
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Granted: 1969-06-17
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Expires: 1986-06-16
Abstract
No abstract record available.
Inventors
- 👤 Richard M Davidson
- 👤 James Reekie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:05
CPC Classifications
G; G03; G03B; G03B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2154013A
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US3124034A
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US1913913A
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US2203437A
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US2077369A
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US2455712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |