Patent US5234453A successfully refreshed from Google Patents.
Patent US1275315A successfully refreshed from Google Patents.
US3131293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computing system
Assignee: International Business Machines Corp
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Filing: 1960-07-14
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Granted: 1964-04-28
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Expires: 1980-07-14
Abstract
No abstract record available.
Inventors
- 👤 Grant H Bush
- 👤 James E Carrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:39
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/491; G06F7/4912; G06F2207/00; G06F2207/491; G06F2207/4911; G06F2207/4914; G06F7/499; G06F7/49905; G06F7/4991
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
IN A FLOATING POINT DECIMAL SYSTEM FOR PERFORMING A FLOATING POINT ADD-SUBTRACT OPERATION ON FIRST AND SECOND NORMALIZED OPERANDS, EACH OPERAND BEING REPRESENTED BY AN N DIGIT MANTISSA AND AN M DIGIT EXPONENT INDICATING THE TRUE DECIMAL LOCATION THEREOF, FIRST AND SECOND M+N DIGIT REGISTERS FOR STORING SAID OPERANDS, RESPECTIVELY, A THIRD M+N DIGIT REGISTER, SAID FIRST REGISTER ALSO STORING THE EXPONENT OF THE RESULT OF SAID OPERATION IN THE M DIGIT POSITIONS THEREOF AND THE N MOST SIGNIFICANT DIGITS THEREOF IN THE N DIGIT POSITIONS THEREOF, SAID THIRD REGISTER STORING THE N LEAST SIGNIFICANT DIGITS OF SAID RESULT IN THE N DIGIT POSITIONS THEREOF AND AN EXPONENT EQUAL TO SAID EXPONENT IN SAID FIRST REGISTER LESS N IN THE M DIGIT POSITIONS THEREOF, AN ADDER FOR PERFORMING SAID OPERATION, MEANS TO COMPARE SAID OPERANDS TO DETERMINE THE LARGER AND SMALLER OF THE ABSOLUTE VALUES THEREOF AND THE TRUE EXPONENT DIFFERENCE ED THEREBETWEEN, MEANS RESPONSIVE TO SAID COMPARISON
Claim 2
Dependent Claim
158 words
IN A FLOATING POINT DECIMAL SYSTEM FOR PERFORMING A FLOATING POINT ADD-SUBTRACT OPERATION ON FIRST AND SECOND NORMALIZED OPERANDS, EACH OPERAND BEING REPRESENTED BY AN N DIGIT MANTISSA AND AN M DIGIT EXPONENT INDICATING THE TRUE DECIMAL LOCATION THEREOF, FIRST AND SECOND M+N DIGIT REGISTERS FOR STORING SAID OPERANDS, RESPECTIVELY, A THIRD M+N DIGIT REGISTER, SAID FIRST REGISTER ALSO STORING THE EXPONENT OF THE RESULT OF SAID OPERATION IN THE M DIGIT POSITIONS THEREOF AND THE N MOST SIGNIFICANT DIGITS THEREOF IN THE N DIGIT POSITIONS THEREOF, SAID THIRD REGISTER STORING THE N LEAST SIGNIFICANT DIGITS OF SAID RESULT IN THE N DIGIT POSITIONS THEREOF AND AN EXPONENT EQUAL TO SAID EXPONENT IN SAID FIRST REGISTER LESS N IN THE M DIGIT POSITIONS THEREOF, AN ADDER FOR PERFORMING SAID OPERATION, MEANS TO COMPARE SAID OPERANDS TO DETERMINE THE LARGER AND SMALLER OF THE ABSOLUTE VALUES THEREOF AND THE TRUE EXPONENT DIFFERENCE ED THEREBETWEEN, MEANS RESPONSIVE TO SAID COMPARISON
References Cited (Backward Citations)
US2538636A
Cited
US3056550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |