Patent US3587183A successfully refreshed from Google Patents.
US3587183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Classroom boards
Assignee: Individual
•
Filing: 1969-02-07
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Granted: 1971-06-28
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Expires: 1989-02-07
Abstract
Abstract THIS INVENTION CONSISTS OF A RECANGULAR CABINET CONTAINING A PLURALITY OF RECESSES THEREIN IN WHICH ARE LOCATED ROLLER CURTAINS, EACH CURTAIN HAS A DIFFERENT SURFACE SUCH AS A CHALKBOARD, CORK BOARD, MAGNETIC BOARD, AND SCREEN FOR THE RECEPTION OF PROJECTED PICTURES. THE AFORESAID CABINET IS MOUNTED ON THE TOP OF TWO RECATGULAR RIGID MEMBERS AGAINST WHICH THE AFORESAID CURTAINS REST WHEN UNROLLED FOR USE. EACH RIGID MEMBER IS HELD IN EQUAL AND PARALLEL SPACED RELATION TO EACH OTHER BY RIGID MEMBER WHICH IS SUPPORTED AT EACH END BY A VERTICALLY DISPOSED AND ADJUSTABLE TUBULAR SUPPORT MOUNTED ON WHEELS THAT PROVIDES MOBILITY FOR THE CLASSROOM BOARDS.
Inventors
- 👤 William E Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:43
CPC Classifications
A; A47; A47B; A47B97/00; A47B97/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |