Patent US2449112A successfully refreshed from Google Patents.
US2449112A
Expired / Lapsed
US
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Object holder for opaque picture projectors
Assignee: Bausch and Lomb Inc
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Filing: 1947-12-02
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Granted: 1948-09-14
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Expires: 1967-12-02
Abstract
No abstract record available.
Inventors
- 👤 Wright W Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:20
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1365599A
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US1158429A
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US1127504A
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US1831766A
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US2200637A
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US2332691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |