US2833331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination chair and blackboard
Assignee: Individual
•
Filing: 1956-07-12
•
Granted: 1958-05-06
•
Expires: 1976-07-12
Abstract
No abstract record available.
Inventors
- 👤 John A Train
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:31
CPC Classifications
A; A47; A47B; A47B41/00; A47B41/04; A47C; A47C7/00; A47C7/62; A47C7/622; A47C7/626
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US346838A
Cited
US458155A
Cited
US487553A
Cited
US1963347A
Cited
US2159517A
Cited
US2357214A
Cited
US2483309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |