Patent US2042815A successfully refreshed from Google Patents.
US2042815A
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US
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Display apparatus and optical system
Assignee: LESTER HOFHEIMER
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Filing: 1933-06-27
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Granted: 1936-06-02
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Expires: 1953-06-27
Abstract
No abstract record available.
Inventors
- 👤 White Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:54
CPC Classifications
G; G09; G09F; G09F19/00; G09F19/12; G09F19/18; G02; G02B; G02B15/00; G02B15/14; G02B15/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-06-02 | 1939-12-02 | 1940-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-06-02 | 1943-12-02 | 1944-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-06-02 | 1947-12-02 | 1948-06-02 | $7700.00 | Window Closed / Lapsed |