Patent US2551318A successfully refreshed from Google Patents.
US2551318A
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Chess instruction apparatus
Assignee: Individual
•
Filing: 1945-06-01
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Granted: 1951-05-01
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Expires: 1965-06-01
Abstract
No abstract record available.
Inventors
- 👤 Drew Morice James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:30
CPC Classifications
A; A63; A63F; A63F3/00; A63F3/00895; A63F3/00173; A63F3/00533; G; G09; G09B; G09B19/00; G09B19/22; A63F3/00261; A63F2003/0034; A63F2003/00347; A63F2003/0035; A63F2003/00558; A63F2003/00943; A63F2003/00946; A63F2003/00955; A63F3/02; A63F3/022; A63F2003/025; A63F3/00574
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US250458A
Cited
US529913A
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US1221493A
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GB198531A
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US1532069A
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US1730640A
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US2084912A
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US2096672A
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US2191991A
Cited
US2298456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |