US3418673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chalk board eraser
Assignee: Individual
•
Filing: 1967-02-06
•
Granted: 1968-12-31
•
Expires: 1987-02-06
Abstract
No abstract record available.
Inventors
- 👤 Andre E Kruth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:25
CPC Classifications
B; B43; B43L; B43L21/00; B43L21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US922148A
Cited
US1550052A
Cited
GB213177A
Cited
US1767322A
Cited
US2336419A
Cited
FR1092030A
Cited
US2955309A
Cited
US3110917A
Cited
US3163943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |