US2547535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual instruction device
Assignee: AUDISCOPE Corp
•
Filing: 1946-03-25
•
Granted: 1951-04-03
•
Expires: 1966-03-25
Abstract
No abstract record available.
Inventors
- 👤 Pierce Edith Howse
- 👤 Edwin M Schantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:39
CPC Classifications
G; G09; G09B; G09B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1239609A
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US1268376A
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US1458460A
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GB378070A
Cited
US1889418A
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US2188098A
Cited
US2122643A
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US2207639A
Cited
US2225084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |