Patent US4142765A successfully refreshed from Google Patents.
Patent US4424039A successfully refreshed from Google Patents.
US4424039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mathematics teaching device
Assignee: Individual
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Filing: 1982-09-29
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Granted: 1984-01-03
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Expires: 2002-09-29
Abstract
Abstract A mathematics teaching device wherein a display surface is divided into eight regions. The first region contains one hundred colored and numbered plaques removably mounted in ten rows. Plaques are within five color groupings and the rows are color-coded as are receiving pockets. Two regions have another set of plaques with an adjacent receiving pocket to permit simple mathematical operations to be performed therein. The other regions are marked for additional operations to be performed therein.
Inventors
- 👤 Jack E. Washburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:17
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
192 words
A mathematics teaching device comprising: (a) a display surface, said surface being divided into a number of regions; (b) a first collection of numbered colored plaques, said plaques being grouped into subdivisions, each of a different color; (c) a multiplicity of receiving means affixed to said display surface for removably receiving said plaques on said display surface; (i) a first portion of said receiving means being mounted in rows and columns in a first region of said display surface, the number of said receiving means within said first region being equal to the number of plaques in said first collection; (ii) a second portion of said receiving mans being mounted in a second region of said display device to facilitate the performance of arithmetic operations thereon; (d) a second collection of numbered colored plaques; (e) container means affixed to said display surface proximate to said second region for removably receiving said second collection of plaques; (f) a number of color-coded receiving means attached to said display surface for removably receiving plaques of said first collection, the number of said receiving means being equal to the number of subdivisions in said first collection.
Claim 2
Dependent Claim
192 words
A mathematics teaching device comprising: (a) a display surface, said surface being divided into a number of regions; (b) a first collection of numbered colored plaques, said plaques being grouped into subdivisions, each of a different color; (c) a multiplicity of receiving means affixed to said display surface for removably receiving said plaques on said display surface; (i) a first portion of said receiving means being mounted in rows and columns in a first region of said display surface, the number of said receiving means within said first region being equal to the number of plaques in said first collection; (ii) a second portion of said receiving mans being mounted in a second region of said display device to facilitate the performance of arithmetic operations thereon; (d) a second collection of numbered colored plaques; (e) container means affixed to said display surface proximate to said second region for removably receiving said second collection of plaques; (f) a number of color-coded receiving means attached to said display surface for removably receiving plaques of said first collection, the number of said receiving means being equal to the number of subdivisions in said first collection.
Claim 3
Dependent Claim
20 words
The device of claim 1 wherein said second collection of plaques and said containers are provided with the same color-coding.
Claim 4
Dependent Claim
39 words
The device of claim 2 wherein said multiplicity of receiving means further comprises a third portion thereof being mounted in a third region of said display device adjacent said second region to facilitate the performance of arithmetic operations thereon.
Claim 5
Dependent Claim
28 words
The device of claim 3 wherein the receiving means mounted in said second and third regions are mounted in a row and a column within each said region.
Claim 6
Dependent Claim
38 words
The device of claim 4 wherein said multiplicity of receiving means further comprises an additional portion mounted in at least one additional region having a row of receiving means therein to facilitate the performance of arithmetic operations thereon.
Claim 7
Dependent Claim
30 words
The device of claim 5 wherein said display surface contains two adjacent small regions each having two spaced receiving means therein, each of said regions containing an arithmetic marking therebetween.
Claim 8
Dependent Claim
22 words
The device of claim 6 further comprising color-coding means mounted within said first region proximate to selected rows of receiving means therein.
Claim 9
Dependent Claim
31 words
The device of claim 7 wherein said first collection of plaques is grouped into five equal subdivisions in ascending numerical order and a color-coded receiving means is provided for each subdivision.
Claim 10
Dependent Claim
20 words
The device of claim 8 wherein said second collection of plaques is the same color as one of said subdivisions.
Claim 11
Dependent Claim
23 words
The device of claim 9 wherein said display surface is divided into at least eight regions for the performance of arithmetic operations therein.
Claim 12
Dependent Claim
32 words
The device of claim 10 wherein said display surface is formed of two portions and further comprises hinge means coupled between said portions for enabling the device to be folded for transport.
Claim 13
Dependent Claim
29 words
The device of claim 10 further comprising support means for engaging the bottom peripheral portion of said display surface and permitting said device to remain in a vertical position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |