Patent US5674075A successfully refreshed from Google Patents.
US5674075A
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Math teaching unit
Assignee: Individual
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Filing: 1996-10-07
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Granted: 1997-10-07
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Expires: 2016-10-07
Abstract
Abstract A digital clock display and a math display are disposed on a surface of a math teaching unit. A processing unit is configured to display time including an hour and a minute on the digital clock display based on control signals from a clock circuit and a clock setting apparatus. The processing unit is configured to display math equations on the math display such that a first operand equals the hour and a second operand equals the minute.
Inventors
- 👤 Betty E. Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:39
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02; G09B19/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A math teaching unit comprising: a. a digital clock display and a math display disposed on a surface thereof; b. a clock circuit; c. a processing unit; d. a clock setting means; e. the processing unit configured to display time including an hour and a minute on the digital clock display based on control signals from the clock circuit and the clock setting means; and f. the processing unit configured to display math equations on the math display such that a first operand equals the hour and a second operand equals the minute.
Claim 2
Dependent Claim
93 words
A math teaching unit comprising: a. a digital clock display and a math display disposed on a surface thereof; b. a clock circuit; c. a processing unit; d. a clock setting means; e. the processing unit configured to display time including an hour and a minute on the digital clock display based on control signals from the clock circuit and the clock setting means; and f. the processing unit configured to display math equations on the math display such that a first operand equals the hour and a second operand equals the minute.
Claim 3
Dependent Claim
52 words
The math teaching unit of claim 1, further including a switching means for signaling the processing unit to display math equations which do not necessarily correspond to the hour and the minute displayed on the clock display, and a keypad configured to input answers to the math equations to the processing unit.
Claim 4
Dependent Claim
38 words
The math teaching unit of claim 1, further including a switching means for signaling the processing unit to display math equations which do not include results thereto, and a keypad configured to input information to the processing unit.
Claim 5
Dependent Claim
41 words
The math teaching unit of claim 1, further including a switching means for ending display of math equations having first and second operands corresponding to the hour and the minute, and a keypad configured to input information to the processing unit.
Claim 6
Dependent Claim
18 words
The math teaching unit of claim 1, wherein the unit is configured to be powered by a battery.
Claim 7
Dependent Claim
21 words
The math teaching unit of claim 1, wherein the unit is configured to be powered by an alternating current power source.
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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) | 2000-10-06 | 2001-04-07 | 2001-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-06 | 2005-04-07 | 2005-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-06 | 2009-04-07 | 2009-10-07 | $7700.00 | Window Closed / Lapsed |