US3084457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational work sheet
Assignee: Individual
•
Filing: 1959-06-08
•
Granted: 1963-04-09
•
Expires: 1979-06-08
Abstract
No abstract record available.
Inventors
- 👤 Andrew F Schott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:51
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/02; G09B3/04; B; B42; B42F; B42F5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A LEGIBLY INSCRIBABLE WORK SHEET ASSEMBLY INCLUDING A BACKBOARD, A TEXT SHEET AND A TRANSPARENT SCRIBING TOP SHEET, SAID TOP SHEET PROVIDING A TRANSPARENT MEMBER AND SAID TRANSPARENT MEMBER BEING PROVIDED WITH A WATER SOLUBLE COATING OF DRIED ERASABLE COATING SOLUTION.
Claim 2
Dependent Claim
41 words
A LEGIBLY INSCRIBABLE WORK SHEET ASSEMBLY INCLUDING A BACKBOARD, A TEXT SHEET AND A TRANSPARENT SCRIBING TOP SHEET, SAID TOP SHEET PROVIDING A TRANSPARENT MEMBER AND SAID TRANSPARENT MEMBER BEING PROVIDED WITH A WATER SOLUBLE COATING OF DRIED ERASABLE COATING SOLUTION.
References Cited (Backward Citations)
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US1421975A
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US2281837A
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US2313787A
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US2347355A
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US2393863A
Cited
US2516727A
Cited
US2670308A
Cited
US2702257A
Cited
US2789373A
Cited
US2991189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |