US3898631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage indicator
Assignee: International Business Machines Corp
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Filing: 1973-12-13
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Granted: 1975-08-05
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Expires: 1993-12-13
Abstract
Abstract This specification describes an apparatus to sense and digitally indicate the number of bytes of storage contained in a memory unit.
Inventors
- 👤 Eugene Clifford Brown
- 👤 Gary Robert Heinberg
- 👤 Arthur Leroy Henry
- 👤 Robert Edward Mahoney
- 👤 Robert Mark Unterberger
- 👤 Thomas Richard Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:14
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/22; G06F11/2289; G06F12/00; G06F12/02; G06F12/06; G06F12/0646; G06F12/0684
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
In a memory in which the amount of storage can be changed in segments by the addition or removal of memory array cards from an interface, apparatus for indicating the amount of storage available in the memory unit, comprising; circuit means associated with each segment of array cards for providing an indication to the interface that the array cards of that segment are present at the interface; detection means at a number of locations in the interface for the generation of a separate signal for the presence of array cards at each of those locations, and logic circuit means for receiving all of the detection signals from the different detection means and providing a binary output indicative of the number of bits of storage present at the interface.
Claim 2
Dependent Claim
128 words
In a memory in which the amount of storage can be changed in segments by the addition or removal of memory array cards from an interface, apparatus for indicating the amount of storage available in the memory unit, comprising; circuit means associated with each segment of array cards for providing an indication to the interface that the array cards of that segment are present at the interface; detection means at a number of locations in the interface for the generation of a separate signal for the presence of array cards at each of those locations, and logic circuit means for receiving all of the detection signals from the different detection means and providing a binary output indicative of the number of bits of storage present at the interface.
Claim 3
Dependent Claim
38 words
The apparatus of claim 1 including comparison means for comparing the output of the logic circuit means with the amount of segments actually installed to give an indication of whether or not the array cards were installed properly.
Claim 4
Dependent Claim
68 words
The structure of claim 2 in which said interface is a plug board with receptacles; said array cards contain connectors to be inserted in the receptacle; said circuit means is a connection between two of said connector means; and said detection means is a voltage source which is connected to an input to the logic means by said connector when the array cards are inserted into the receptacle.
References Cited (Backward Citations)
US3191095A
Cited
US3691399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |