Patent US3363337A successfully refreshed from Google Patents.
US3363337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and devices for teaching writing skills
Assignee: Meredith Publishing Co
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Filing: 1965-12-10
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Granted: 1968-01-16
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Expires: 1985-12-10
Abstract
No abstract record available.
Inventors
- 👤 Burrhus F Skinner
- 👤 Alvin S Ostashever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:22
CPC Classifications
G; G09; G09B; G09B11/00; G09B11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A DEVICE FOR TEACHING WRITING SKILLS COMPRISING A WORK SURFACE, A VISIBLE CONTROL IMAGE ASSOCIATED WITH SAID SURFACE, AT LEAST ONE SECOND IMAGE WHICH IS AT LEAST PARTIALLY INVISIBLE AND WHICH IS LOGICALLY RELATED IN GEOMETRICAL CONFIGURATION TO SAID CONTROL IMAGE, THE INVISIBLE PORTION OF SAID SECOND IMAGE BEING DEFINED BY A FIRST AREA COMPRISING A METAL SALT WHICH CAUSES A FIRST VISUAL EFFECT WHEN CONTACTED WITH A COLOR REACTANT SELECTED FROM THE GROUP CONSISTING OF XYLENOL ORANGE, ERIOCHROME BLACK T, PAN, PYROCATECHOL VIOLET, ALIZARIN RED S, AND DITHIZONE DISPENSED FROM A WRITING INSTRUMENT, SAID WORK SURFACE INCLUDING A SECOND AREA ADJACENT TO AND INDISCERNIBEL FROM SAID FIRST AREA AND COMPRISING A MATERIAL WHICH CAUSES A SECOND, DIFFERENT, VISUAL EFFECT WHEN CONTACTED WITH SAID COLOR REACTANT DISPENSED FROM SAID WRITING INSTRUMENT.
Claim 2
Independent Claim
131 words
A DEVICE FOR TEACHING WRITING SKILLS COMPRISING A WORK SURFACE, A VISIBLE CONTROL IMAGE ASSOCIATED WITH SAID SURFACE, AT LEAST ONE SECOND IMAGE WHICH IS AT LEAST PARTIALLY INVISIBLE AND WHICH IS LOGICALLY RELATED IN GEOMETRICAL CONFIGURATION TO SAID CONTROL IMAGE, THE INVISIBLE PORTION OF SAID SECOND IMAGE BEING DEFINED BY A FIRST AREA COMPRISING A METAL SALT WHICH CAUSES A FIRST VISUAL EFFECT WHEN CONTACTED WITH A COLOR REACTANT SELECTED FROM THE GROUP CONSISTING OF XYLENOL ORANGE, ERIOCHROME BLACK T, PAN, PYROCATECHOL VIOLET, ALIZARIN RED S, AND DITHIZONE DISPENSED FROM A WRITING INSTRUMENT, SAID WORK SURFACE INCLUDING A SECOND AREA ADJACENT TO AND INDISCERNIBEL FROM SAID FIRST AREA AND COMPRISING A MATERIAL WHICH CAUSES A SECOND, DIFFERENT, VISUAL EFFECT WHEN CONTACTED WITH SAID COLOR REACTANT DISPENSED FROM SAID WRITING INSTRUMENT.
References Cited (Backward Citations)
US2068497A
Cited
US2618866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |