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US2614338A
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Self-scoring test device
Assignee: CALIFORNIA TEST BUREAU
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Filing: 1949-06-25
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Granted: 1952-10-21
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Expires: 1969-06-25
Abstract
No abstract record available.
Inventors
- 👤 Ethel M Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:39
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/06; G09B3/08; A; A63; A63F; A63F9/00; A63F9/18; G09B3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |