Patent US3216138A successfully refreshed from Google Patents.
US3216138A
Expired / Lapsed
US
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Continuous sequence slide projector means
Assignee: Viewlex Inc
•
Filing: 1962-06-01
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Granted: 1965-11-09
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Expires: 1982-06-01
Abstract
No abstract record available.
Inventors
- 👤 Henry J Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:12
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02; G03B23/04; G03B23/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US239910A
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US1325825A
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US2732758A
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US773786A
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US940479A
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CH190287A
Cited
US2874497A
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US3023669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |