David S Shapiro

US Patent:

41986849, Apr 15, 1980

Filed:

Oct 13, 1976

Appl. No.:

5/731611

Inventors:

Roy W. Reach - Sudbury MA
William M. Kahn - Brighton MA
David Shapiro - Lincoln MA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 302
G06F 314
G06F 738

US Classification:

364900

Abstract:

An algebraic electronic calculator is provided having a keyboard input unit with digit keys for entering numbers into the calculator and control keys for entering add, subtract, multiply, divide, left parenthesis, right parenthesis, storage register designating, square root, equals, and other operators into the calculator. A record of each number and operator entered into the calculator is printed out by an output printer so that a mathematical problem may be continuously monitored as it is being entered into the calculator. Depression of the square root control key initiates computation of the square root of a number stored in the calculator and printout of the result. The calculator also includes provision for computation of another such unary function such as cube root if desired. Depression of the equals control key is accompanied by evaluation of all the previously entered numbers and operators and printout of the results. Provision is made in the calculator for learning a sequence of operators as they are entered into the calculator during manually-controlled evaluation of a mathematical problem and for subsequently automatically evaluating such a mathematical problem in accordance with the learned sequence of operators.

US Patent:

43815545, Apr 26, 1983

Filed:

Aug 13, 1981

Appl. No.:

6/292371

Inventors:

Roy W. Reach - Sudbury MA
William M. Kahn - Brighton MA
David Shapiro - Lincoln MA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 3023
G06F 306
G06F 314

US Classification:

364900

Abstract:

A programmable electronic calculator is disclosed for numerical evaluation of mathematical problems through application of one or more basic mathematical operators, properly grouped, to each input numerical operand of a mathematical problem according to the accepted rules of mathematical combinations. One may select any numerical operand, any of the four basic arithmetic operators, left parenthesis and right parenthesis to denote groupings, a storage register for receiving a numerical operand to be used in computation or a numerical operand representing a result of a partial or final computation, or a storage register whose contents it is desired to print. Entry of each numerical operand and mathematical operator is accompanied by a printed record of that numerical operand and that mathematical operator so that the mathematical problem may be continually monitored as it is being entered. Depression of an equals key is followed by evaluation of previously designated operations and printing of the result. Selection of a left (or opening) parenthesis causes the contents of first and second accumulator registers in an arithmetic unit to shift to third and fourth accumulator registers in the arithmetic unit respectively.

US Patent:

43097618, Jan 5, 1982

Filed:

Jul 26, 1979

Appl. No.:

6/060950

Inventors:

Roy W. Reach - Sudbury MA
William M. Kahn - Brighton MA
David Shapiro - Lincoln MA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 3023

US Classification:

364900

Abstract:

A programmable electronic calculator for numerical evaluation of mathematical problems operates through the application of one or more basic mathematical operators, properly grouped, to each input numerical operand of a mathematical problem according to the accepted rules of mathematical combinations. One may select any numerical operand, any of the four basic arithmetic operators, left parenthesis and right parenthesis to denote groupings, a storage register for receiving a numerical operand to be used in computation or a numerical operand representing a result of a partial or final computation, or a storage register whose contents it is desired to print. Entry of each numerical operand and mathematical operator is accompanied by a printed record of that numerical operand and that mathematical operator so that the mathematical problem may be continually monitored as it is being entered. Depression of an equals key is followed by evaluation of previously designated operations and printing of the result. Selection of a left (or opening) parenthesis causes the contents of first and second accumulator registers in an arithmetic unit to shift to third and fourth accumulator registers in the arithmetic unit respectively.

US Patent:

39965627, Dec 7, 1976

Filed:

Aug 22, 1973

Appl. No.:

5/390645

Inventors:

Roy W. Reach - Sudbury MA
William M. Kahn - Brighton MA
David Shapiro - Lincoln MA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 738

US Classification:

3401725

Abstract:

A programmable electronic calculator is disclosed for numerical evaluation of mathematical problems through application of one or more basic mathematical operators, properly grouped, to each input numerical operand of a mathematical problem according to the accepted rules of mathematical combinations. One may select any numerical operand, any of the four basic arithmetic operators, left parenthesis and right parenthesis to denote groupings, a storage register for receiving a numerical operand to be used in a computation or a numerical operand representing a result of a partial or final computation, or a storage register whose contents it is desired to print. Entry of each numerical operand and mathematical operator is accompanied by a printed record of that numerical operand and that mathematical operator so that the mathematical problem may be continually monitored as it is being entered. Depression of an equals key is followed by evaluation of previously designated operations and printing of the result. Selection of a left (or opening) parenthesis causes the contents of first and second accumulator registers in an arithmetic unit to shift to third and fourth accumulator registers in the arithmetic unit respectively.

US Patent:

46113070, Sep 9, 1986

Filed:

Sep 24, 1985

Appl. No.:

6/780225

Inventors:

Roy W. Reach - Sudbury MA
William M. Kahn - Brighton MA
David Shapiro - Lincoln MA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 3023
G06F 303

US Classification:

364900

Abstract:

A programmable electronic calculator is provided for numerical evaluation of mathematical problems through application of one or more mathematical operators to each input numerical operand of a mathematical problem according to accepted rules of mathematical combinations. Entry of each numerical operand and mathematical operator is accompanied by a printed record of that numerical operand and that mathematical operator so that the mathematical problem may be continually monitored as it is being entered. Depression of an equals key is followed by evaluation of previously designated operations and printing of the result. One may select a learn mode in which steps are entered in a learn memory by working out a mathematical problem, each selected operation corresponding to a step in the learn memory. Thereafter, one may select an automatic computation mode to cause the operations previously stored in the learn memory to be carried out in sequence until a desired result is obtained or a predetermined step in learn memory is reached. A method of capturing source data is also provided whereby coded signals representative of source data are generated in response to operation of a keyboard input unit, source data represented by the coded signals is printed out by an output printer unit upon generation of those coded signals to provide a visual display of the source data, and coded signals are recorded by storing them in a memory unit from which they may be substantially read out to obtain an indication of the source data represented thereby.