US3135059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Writing slate device
Assignee: Individual
•
Filing: 1962-05-04
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Granted: 1964-06-02
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Expires: 1982-05-04
Abstract
No abstract record available.
Inventors
- 👤 Benjamin J Barish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:03
CPC Classifications
G; G09; G09B; G09B11/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
139 words
A DEVICE OF THE CHARACTER DESCRIBED COMPRISING: A FIRST BACKING SHEET; A PLURALITY OF AT LEAST TWO INTERMEDIATE BACKING SHEETS STACKED ONE ON TOP OF THE OTHER OVERLYING SAID FIRST BACKING SHEET; AND AN IMPRESSION SHEET OVERLYING THE TOPMOST BACKING SHEET; SAID INTERMEDIATE BACKING SHEETS BEING FORMED WITH OPENINGS THEREIN; THE OPENINGS IN EACH INTERMEDIATE BACKING SHEET COMPRISING FIRST OPENINGS ALIGNED WITH THE OPENINGS IN ALL THE UNDERLYING INTERMEDIATE BACKING SHEETS AND SECOND OPENINGS NON-ALIGNED WITH ANY OPENINGS IN THE UNDERLYING BACKING SHEETS, WHEREBY SURFACES OF ALL SAID BACKING SHEETS ARE EXPOSED TO SAID IMPRESSION SHEET; SAID EXPOSED SURFACES BEING COLORED; SAID IMPRESSION SHEET BEING SUFFICIENTLY OPAQUE TO NORMALLY HIDE THE COLOR OF SAID EXPOSED COLORED SURFACES BUT BEING RENDERED SUFFICIENTLY TRANSPARENT UPON THE APPLICATION OF LOCAL PRESSURE TO RENDER THE COLOR OF SAID EXPOSED COLORED SURFACES VISIBLE THERETHROUGH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |