Patent US4512746A successfully refreshed from Google Patents.
US4512746A
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Mathematical teaching cards
Assignee: Individual
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Filing: 1982-09-15
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Granted: 1985-04-23
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Expires: 2002-09-15
Abstract
Abstract A series of mathematical teaching cards consisting of a plurality of decks each having a level of difficulty identification, a plurality of sets of mathematical statements having the same answer, and a deck identification number is disclosed and described. The teaching cards may be used for multiplication, division, subtraction, and addition or any combination thereof.
Inventors
- 👤 Donald Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:45
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02; A; A63; A63F; A63F1/00; A63F1/02; A63F9/00; A63F9/0098
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
A series of multiplication table teaching cards having a plurality of decks of cards, each card having a front side and a back side, and each deck having; a different subgroup of multiplication statements, a plurality of sets of cards within each deck, each set including a plurality of cards, with each card within a set having a simple multiplication statement on the front side, and having an unstated answer which is the same answer as that of other cards within said set, and said plurality of decks of cards being divided into sub-pluralities of decks, each sub-plurality having a different level of difficulty and having distinctive indicia indicating the level of difficulty of said sub-plurality.
Claim 2
Dependent Claim
116 words
A series of multiplication table teaching cards having a plurality of decks of cards, each card having a front side and a back side, and each deck having; a different subgroup of multiplication statements, a plurality of sets of cards within each deck, each set including a plurality of cards, with each card within a set having a simple multiplication statement on the front side, and having an unstated answer which is the same answer as that of other cards within said set, and said plurality of decks of cards being divided into sub-pluralities of decks, each sub-plurality having a different level of difficulty and having distinctive indicia indicating the level of difficulty of said sub-plurality.
Claim 3
Dependent Claim
22 words
The teaching cards in accordance with claim 1 wherein each deck has a deck identifying indicia associated with it marked on it.
Claim 4
Dependent Claim
22 words
The teaching cards in accordance with claim 2 wherein said deck identifying indicia is marked on the front side of said cards.
Claim 5
Dependent Claim
34 words
The teaching cards in accordance with claim 1 wherein said indicia showing the level of each deck are identifying colors used on the back face of each card of each deck within said level.
Claim 6
Dependent Claim
21 words
The teaching cards in accordance with claim 1 where said deck identifying indicia is an alpha numeric character representing each deck.
Claim 7
Dependent Claim
25 words
The teaching cards in accordance with claim 1 where there are three levels of difficulty, and each level contains 4 decks of 36 cards each.
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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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |