Patent CH163694A successfully refreshed from Google Patents.
US1928025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Astronomical appliance for educational and other purposes
Assignee: Individual
•
Filing: 1932-04-05
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Granted: 1933-09-26
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Expires: 1952-04-05
Abstract
No abstract record available.
Inventors
- 👤 Mcewan Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
G; G09; G09B; G09B27/00; G09B27/04
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) | 1936-09-25 | 1937-03-27 | 1937-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-09-25 | 1941-03-27 | 1941-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-09-25 | 1945-03-27 | 1945-09-26 | $7700.00 | Window Closed / Lapsed |