Patent US1487747A successfully refreshed from Google Patents.
Patent US2074102A successfully refreshed from Google Patents.
US2074102A
Expired / Lapsed
US
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Blackboard compass
Assignee: Individual
•
Filing: 1935-06-20
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Granted: 1937-03-16
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Expires: 1955-06-20
Abstract
No abstract record available.
Inventors
- 👤 Elmer W Christy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:03
CPC Classifications
B; B43; B43L; B43L9/00; B43L9/02; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32008; Y10T403/32016; Y10T403/32081; Y10T403/32254; Y10T403/32262; Y10T403/32286
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) | 1940-03-15 | 1940-09-14 | 1941-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-03-15 | 1944-09-14 | 1945-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-03-15 | 1948-09-14 | 1949-03-16 | $7700.00 | Window Closed / Lapsed |