US3233345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational devices
Assignee: Individual
•
Filing: 1964-07-01
•
Granted: 1966-02-08
•
Expires: 1984-07-01
Abstract
No abstract record available.
Inventors
- 👤 Lelia H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:11
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A MATHEMATICS LEARNING AID COMPRISING: A PLATEFORM BASE MEMBER, TWO SETS OF NUMBERS IMPRESSED ON A FACE OF SAID BASE MEMBER, SAID SETS EXTENDING ALONG CONNECTED RIGHT-AND LEFT-HAND SEMI-CIRCLES AND THE NUMBERS MAKING UP EACH SET BEING CIRCUMFERENTIALLY SPACED FROM ONE ANOTHER AND DIAMETRICALLY OPPOSED TO NUMBERS OF THE OTHER SET, AN INDICATOR PIVOTALLY CONNECTED TO SAID BASE MEMBER FOR TURNING MOVEMENT ABOUT AN AXIS EXTENDING THERETHROUGH ON THE CENTER OF THE CIRCLE DEFINED BY SAID TWO SETS OF NUMBERS, SAID INDICATOR HAVING LENGTH WHICH IS SLIGHTLY LESS THAN THE DIAMETER OF SAID CIRCLE AND TERMINATING IN POINTS THEREBY SERVING TO VISUALLY COUPLE THE DIAMETRICALLY OPPOSED NUMBERS OF THE SETS THEREOF WITH WHICH THE INDICATOR IS ALIGNED AT ANY ONE TIME, STOP MEANS CARRIED BY SAID BASE MEMBER FOR LIMITING MOTION OF THE INDICATOR IN EITHER DIRECTION PAST THE VERTICAL DIAMETER LINE OF THE CIRCLE, SAID INDICATOR HAVING OPERATIONAL SYMBOLS AND A NUMBER IMPRESSED THEREON WHICH ARE READABLE LEFT TO RIGHT ALONG THE LENGTH THEREOF, THE AFORESAID NUMBERS AND OPERATIONAL SYMBOLS BEARING A MATHEMATICAL RELATION SUCH THAT WHEN THE INDICATOR IS TURNED TO ANY ONE NUMBER OF THE LEFT-HAND SEMI-CIRCULAR SET THEREOF SAID NUM-
Claim 2
Dependent Claim
194 words
A MATHEMATICS LEARNING AID COMPRISING: A PLATEFORM BASE MEMBER, TWO SETS OF NUMBERS IMPRESSED ON A FACE OF SAID BASE MEMBER, SAID SETS EXTENDING ALONG CONNECTED RIGHT-AND LEFT-HAND SEMI-CIRCLES AND THE NUMBERS MAKING UP EACH SET BEING CIRCUMFERENTIALLY SPACED FROM ONE ANOTHER AND DIAMETRICALLY OPPOSED TO NUMBERS OF THE OTHER SET, AN INDICATOR PIVOTALLY CONNECTED TO SAID BASE MEMBER FOR TURNING MOVEMENT ABOUT AN AXIS EXTENDING THERETHROUGH ON THE CENTER OF THE CIRCLE DEFINED BY SAID TWO SETS OF NUMBERS, SAID INDICATOR HAVING LENGTH WHICH IS SLIGHTLY LESS THAN THE DIAMETER OF SAID CIRCLE AND TERMINATING IN POINTS THEREBY SERVING TO VISUALLY COUPLE THE DIAMETRICALLY OPPOSED NUMBERS OF THE SETS THEREOF WITH WHICH THE INDICATOR IS ALIGNED AT ANY ONE TIME, STOP MEANS CARRIED BY SAID BASE MEMBER FOR LIMITING MOTION OF THE INDICATOR IN EITHER DIRECTION PAST THE VERTICAL DIAMETER LINE OF THE CIRCLE, SAID INDICATOR HAVING OPERATIONAL SYMBOLS AND A NUMBER IMPRESSED THEREON WHICH ARE READABLE LEFT TO RIGHT ALONG THE LENGTH THEREOF, THE AFORESAID NUMBERS AND OPERATIONAL SYMBOLS BEARING A MATHEMATICAL RELATION SUCH THAT WHEN THE INDICATOR IS TURNED TO ANY ONE NUMBER OF THE LEFT-HAND SEMI-CIRCULAR SET THEREOF SAID NUM-
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |