US3432944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blackboard
Assignee: Individual
•
Filing: 1965-09-01
•
Granted: 1969-03-18
•
Expires: 1985-09-01
Abstract
No abstract record available.
Inventors
- 👤 Toyo Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:20
CPC Classifications
B; B43; B43L; B43L1/00; B43L1/04; B43L1/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US86177A
Cited
US467561A
Cited
US572004A
Cited
US1865863A
Cited
US1991882A
Cited
US2517069A
Cited
US2643466A
Cited
US3130113A
Cited
US2869263A
Cited
US2968876A
Cited
US2951299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |