US3947976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mathematical problem and number generating systems
Assignee: Individual
•
Filing: 1975-03-10
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Granted: 1976-04-06
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Expires: 1995-03-10
Abstract
Abstract Apparatus for deriving two output numbers generate a first number and provide a second number having a plurality of digit places by subjecting the first number to a predetermined mathematical operation, and derive one of the two desired output numbers from a first digit place of the second number and the other of the two desired output numbers from a different second digit place of the second number.
Inventors
- 👤 William R. Hafel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:08
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02; G09B19/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
An apparatus for deriving two output numbers, comprising in combination: means for providing a first number; means connected to said first number providing means for providing a second number having a plurality of digit places, by subjecting said first number to a predetermined mathematical operation; means connected to said second number providing means for deriving one of said two output numbers from a first digit place of said second number, and the other of said two output numbers from a different second digit place of said second number.
Claim 2
Independent Claim
88 words
An apparatus for deriving two output numbers, comprising in combination: means for providing a first number; means connected to said first number providing means for providing a second number having a plurality of digit places, by subjecting said first number to a predetermined mathematical operation; means connected to said second number providing means for deriving one of said two output numbers from a first digit place of said second number, and the other of said two output numbers from a different second digit place of said second number.
Claim 3
Dependent Claim
25 words
An apparatus as claimed in claim 1, wherein: said second number providing means include means for subjecting said first number to a predetermined root function.
Claim 4
Dependent Claim
25 words
An apparatus as claimed in claim 1, wherein: said second number providing means include means for subjecting said second number to a predetermined transcendental function.
Claim 5
Dependent Claim
21 words
An apparatus as claimed in claim 1, wherein: said first number providing means include means for providing said first number randomly.
Claim 6
Dependent Claim
109 words
In apparatus for generating mathematical problems, the improvement comprising in combination: means for providing a first number; means connected to said first number providing means for providing a second number having a plurality of digit places, by subjecting said first number to a predetermined mathematical operation; means connected to said second number providing means for deriving one of two output numbers from a first digit place of said second number, and the other of said two output numbers from a different second digit place of said second number; and means connected to said deriving means for presenting a mathematical problem including said one and said other derived output numbers.
Claim 7
Dependent Claim
109 words
In apparatus for generating mathematical problems, the improvement comprising in combination: means for providing a first number; means connected to said first number providing means for providing a second number having a plurality of digit places, by subjecting said first number to a predetermined mathematical operation; means connected to said second number providing means for deriving one of two output numbers from a first digit place of said second number, and the other of said two output numbers from a different second digit place of said second number; and means connected to said deriving means for presenting a mathematical problem including said one and said other derived output numbers.
Claim 8
Dependent Claim
25 words
An apparatus as claimed in claim 5, wherein: said second number providing means include means for subjecting said first number to a predetermined root function.
Claim 9
Dependent Claim
25 words
An apparatus as claimed in claim 5, wherein: said second number providing means include means for subjecting said second number to a predetermined transcendental function.
Claim 10
Dependent Claim
21 words
An apparatus as claimed in claim 5, wherein: said first number providing means include means for providing said first number randomly.
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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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |