Patent US3147556A successfully refreshed from Google Patents.
US3147556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calculating device
Assignee: Individual
•
Filing: 1961-09-14
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Granted: 1964-09-08
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Expires: 1981-09-14
Abstract
No abstract record available.
Inventors
- 👤 Murray D Prusmack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:16
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN A CALCULATING DEVICE FOR TEACHING BASIC MATHEMATICS, THE COMBINATION COMPRISING: A MANIPULATING DEVICE INCLUDING A STATIONARY LONGITUDINAL RULE BODY, FIRST AND SECOND EQUAL LENGTH LONGITUDINAL MEMBERS MOUNTED ON SAID BODY MEDIAL THEREOF AND FOR INDEPENDENT SLIDEABLE AND PARALLEL MOVEMENT THEREALONG; STOPS ON OPPOSITE ENDS OF SAID BODY FOR LIMITING MOVEMENT OF SAID FIRST AND SECOND LONGITUDINAL MEMBERS TO A DISTANCE APPROXIMATELY EQUAL TO ONE-HALF THE LENGTH OF SAID BODY; ATTACHMENT MEANS ON SAID BODY RECEIVING SAID MEMBERS; A SERIES OF EQUIDISTANTLY SPACED GRADUATIONS ON SAID FIRST MEMBER DEFINING FACE PORTIONS THEREBETWEEN, THE FIRST OF WHICH IS MARKED WITH A POINTER AND IS FOLLOWED BY A SERIES OF NUMBERS PROGRESSIVELY INCREASING IN VALUE FROM 1 TO 10; A SERIES OF EQUIDISTANTLY SPACED GRADUATIONS ON SAID SECOND MEMBER DEFINING FACE PORTIONS THEREBETWEEN MARKED WITH NUMBERS PROGRESSIVELY DECREASING IN VALUE FROM 10
Claim 2
Dependent Claim
140 words
IN A CALCULATING DEVICE FOR TEACHING BASIC MATHEMATICS, THE COMBINATION COMPRISING: A MANIPULATING DEVICE INCLUDING A STATIONARY LONGITUDINAL RULE BODY, FIRST AND SECOND EQUAL LENGTH LONGITUDINAL MEMBERS MOUNTED ON SAID BODY MEDIAL THEREOF AND FOR INDEPENDENT SLIDEABLE AND PARALLEL MOVEMENT THEREALONG; STOPS ON OPPOSITE ENDS OF SAID BODY FOR LIMITING MOVEMENT OF SAID FIRST AND SECOND LONGITUDINAL MEMBERS TO A DISTANCE APPROXIMATELY EQUAL TO ONE-HALF THE LENGTH OF SAID BODY; ATTACHMENT MEANS ON SAID BODY RECEIVING SAID MEMBERS; A SERIES OF EQUIDISTANTLY SPACED GRADUATIONS ON SAID FIRST MEMBER DEFINING FACE PORTIONS THEREBETWEEN, THE FIRST OF WHICH IS MARKED WITH A POINTER AND IS FOLLOWED BY A SERIES OF NUMBERS PROGRESSIVELY INCREASING IN VALUE FROM 1 TO 10; A SERIES OF EQUIDISTANTLY SPACED GRADUATIONS ON SAID SECOND MEMBER DEFINING FACE PORTIONS THEREBETWEEN MARKED WITH NUMBERS PROGRESSIVELY DECREASING IN VALUE FROM 10
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) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |