US3716935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic board with chart and markers
Assignee: Individual
•
Filing: 1971-08-05
•
Granted: 1973-02-20
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Expires: 1991-08-05
Abstract
Abstract A magnetic board having a ferromagnetic chart and permanently magnetized markers. The board comprises a base board having a continuous strip of permanently magnetized material along the circumferential edges thereof and a filler material of nonpermanent magnetic material filling the space intermediate said continuous strip.
Inventors
- 👤 H Friederichs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:17
CPC Classifications
G; G09; G09F; G09F7/00; G09F7/02; G09F7/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A magnetic board which comprises: a right angled base board; a continuous strip of permanent magnetic material having a closely arranged pole magnetism along the circumferential side edges of said right angled base board; a non-permanent magnetic filler material filling the space intermediate said continuous strip of permanently magnetized material, said filler material forming a continuous plane with said continuous strip of permanently magnetized material; a ferromagnetic chart mounted onto said permanently magnetized strip; and at least one permanently magnetized marker placed as desired on said ferromagnetic chart.
Claim 2
Dependent Claim
88 words
A magnetic board which comprises: a right angled base board; a continuous strip of permanent magnetic material having a closely arranged pole magnetism along the circumferential side edges of said right angled base board; a non-permanent magnetic filler material filling the space intermediate said continuous strip of permanently magnetized material, said filler material forming a continuous plane with said continuous strip of permanently magnetized material; a ferromagnetic chart mounted onto said permanently magnetized strip; and at least one permanently magnetized marker placed as desired on said ferromagnetic chart.
Claim 3
Dependent Claim
35 words
The magnetic board as defined in claim 1 wherein said ferromagnetic chart is comprised of a ferromagnetic foil and a thin layer of non-permanent magnetic material on at least one side of said ferromagnetic foil.
Claim 4
Dependent Claim
23 words
The magnetic board as defined in claim 2, wherein the material of said permanently magnetized strip is comprised of a rubber based material.
Claim 5
Dependent Claim
24 words
The magnetic board as defined in claim 2, wherein the material of said permanently magnetized strip is comprised of a plastic resin based material.
Claim 6
Dependent Claim
25 words
The magnetic board as defined in claim 2, wherein the material of said permanently magnetized strip comprises a permanent magnetic powder on an oxydized base.
Claim 7
Dependent Claim
22 words
The magnetic board as defined in claim 2, wherein the thin layer of non-permanent magnetic material on said ferromagnetic chart is paper.
Claim 8
Dependent Claim
22 words
The magnetic board as defined in claim 2, wherein the thin layer of non-permanent magnetic material on said ferromagnetic chart is plastic.
Claim 9
Dependent Claim
20 words
The magnetic board as defined in claim 2, wherein said non-permanent magnetic filler material is comprised of a fibrous material.
Claim 10
Dependent Claim
20 words
The magnetic board as defined in claim 2, wherein said non-permanent magnetic filler material is comprised of a carton material.
Claim 11
Dependent Claim
20 words
The magnetic board as defined in claim 2, wherein said non-permanent magnetic filler material is comprised of a plastic material.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |