Patent US3134298A successfully refreshed from Google Patents.
US3134298A
Expired / Lapsed
US
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Focusing means for slide projector
Assignee: Viewlex Inc
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Filing: 1961-02-02
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Granted: 1964-05-26
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Expires: 1981-02-02
Abstract
No abstract record available.
Inventors
- 👤 William A Volkholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:20
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/53
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1271929A
Cited
US1950166A
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US2008020A
Cited
US2705438A
Cited
US3000258A
Cited
DE1076965B
Cited
FR1226261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |