Patent US2045095A successfully refreshed from Google Patents.
US4400798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Memory patching system
Assignee: Tektronix Inc
•
Filing: 1981-07-13
•
Granted: 1983-08-23
•
Expires: 2001-07-13
Abstract
Abstract A memory patching system which transfers permanent-type information in a read-only memory (ROM) to a random access memory (RAM) and modifying contents of the RAM in accordance with patch information in an eraseable programmable ROM is disclosed.
Inventors
- 👤 Robert S. Francis
- 👤 Bruce C. Stofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:56
CPC Classifications
G; G06; G06F; G06F8/00; G06F8/60; G06F8/65; G06F8/66
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
50 words
A memory patching system, comprising; a first memory containing permanent type information; a second memory containing patch information; a third memory; and control means for transferring contents of said first memory to said third memory, and modifying contents of said third memory in accordance with contents of said second memory.
Claim 2
Dependent Claim
50 words
A memory patching system, comprising; a first memory containing permanent type information; a second memory containing patch information; a third memory; and control means for transferring contents of said first memory to said third memory, and modifying contents of said third memory in accordance with contents of said second memory.
Claim 3
Dependent Claim
17 words
A memory patching system according to claim 1, wherein said first memory is a read only memory.
Claim 4
Dependent Claim
19 words
A memory patching system according to claim 1, wherein said second memory is an eraseable programmable read only memory.
Claim 5
Dependent Claim
23 words
A memory patching system according to claim 3, wherein said eraseable programmable read only memory is an electrically eraseable programmable read only memory.
Claim 6
Dependent Claim
17 words
A memory patching system according to claim 1, wherein said third memory is a random access memory.
Claim 7
Dependent Claim
15 words
A memory patching system according to claim 1, wherein said control means includes a microprocessor.
Claim 8
Dependent Claim
22 words
A memory patching system according to claim 1, wherein said control means controls to store said patch information in said second memory.
Claim 9
Dependent Claim
74 words
A memory patching system, comprising; an unalterable read-only memory storing permanent type information; an eraseable programmable read-only memory; a random access memory; and control means for storing patch information in said eraseable programmable read only memory, transferring said permanent-type information stored in said unalterable read only memory to said random access memory, and modifying said transferred information in said random access memory in accordance with said patch information in said eraseable programmable read-only memory.
Claim 10
Dependent Claim
74 words
A memory patching system, comprising; an unalterable read-only memory storing permanent type information; an eraseable programmable read-only memory; a random access memory; and control means for storing patch information in said eraseable programmable read only memory, transferring said permanent-type information stored in said unalterable read only memory to said random access memory, and modifying said transferred information in said random access memory in accordance with said patch information in said eraseable programmable read-only memory.
Claim 11
Dependent Claim
27 words
A memory patching system according to claim 8, wherein said patch information includes data information and address information corresponding to the permanent type information to be modified.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |