Patent US2532537A successfully refreshed from Google Patents.
US2532537A
Expired / Lapsed
US
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Protractoboard
Assignee: Individual
•
Filing: 1945-07-02
•
Granted: 1950-12-05
•
Expires: 1965-07-02
Abstract
No abstract record available.
Inventors
- 👤 Charles C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:31
CPC Classifications
B; B43; B43L; B43L7/00; B43L7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US527134A
Cited
US824966A
Cited
US976019A
Cited
US1020253A
Cited
US1389904A
Cited
US1440993A
Cited
FR576708A
Cited
US1906300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |