Patent US2431847A successfully refreshed from Google Patents.
US2431847A
Expired / Lapsed
US
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Map projection device
Assignee: DUSEN ENGINEERING Co VAN
•
Filing: 1943-11-08
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Granted: 1947-12-02
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Expires: 1963-11-08
Abstract
No abstract record available.
Inventors
- 👤 Lawrence W Van Dusen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:05
CPC Classifications
G; G09; G09B; G09B29/00; G09B29/003; G09B29/005
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |