Patent US2540872A successfully refreshed from Google Patents.
US2540872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk slide transparency projector
Assignee: Individual
•
Filing: 1948-07-21
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Granted: 1951-02-06
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Expires: 1968-07-21
Abstract
No abstract record available.
Inventors
- 👤 Fleischer Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:05
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/08; G03B23/10; G03B23/105; Y; Y10; Y10S; Y10S353/00; Y10S353/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1313241A
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US1696831A
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US728655A
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US682416A
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US1019932A
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US1446999A
Cited
US1584708A
Cited
GB479748A
Cited
US2311056A
Cited
US2425217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |