Patent US2164412A successfully refreshed from Google Patents.
US2164412A
Expired / Lapsed
US
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Navigating apparatus for instruction purposes
Assignee: Siemens APP und Maschinen GmbH
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Filing: 1937-07-30
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Granted: 1939-07-04
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Expires: 1957-07-30
Abstract
No abstract record available.
Inventors
- 👤 Koster Paul Eduard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:53
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/24
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) | 1942-07-03 | 1943-01-02 | 1943-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-07-03 | 1947-01-02 | 1947-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-07-03 | 1951-01-02 | 1951-07-04 | $7700.00 | Window Closed / Lapsed |