Patent US2861343A successfully refreshed from Google Patents.
US2861343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blackboard ruling device
Assignee: Individual
•
Filing: 1957-03-29
•
Granted: 1958-11-25
•
Expires: 1977-03-29
Abstract
No abstract record available.
Inventors
- 👤 James O Click
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:25
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/02; B43L13/04; B43L13/041
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US523719A
Cited
US561585A
Cited
US668957A
Cited
US858254A
Cited
US1107340A
Cited
US1140143A
Cited
US2660791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |