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US2420090A
Expired / Lapsed
US
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Straightedge protractor
Assignee: Individual
•
Filing: 1945-06-23
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Granted: 1947-05-06
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Expires: 1965-06-23
Abstract
No abstract record available.
Inventors
- 👤 Paul A Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:35
CPC Classifications
B; B43; B43L; B43L7/00; B43L7/10; B43L7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE238718C
Cited
US1031665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |