US3760366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unprintable character recognition
Assignee: International Business Machines Corp
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Filing: 1971-09-15
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Granted: 1973-09-18
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Expires: 1991-09-15
Abstract
Abstract A distinctive code for each character that appears on the type train of a printer is stored in a train image field. At the time of loading this field an associative bit is stored at a particular address in an associative field, the address being identifiable with the numerical value of the bits in the code for each character. When characters to be printed are loaded into the print line buffer of the printer, the address for the associative bit is accessed directly from the print line buffer data register and the presence of the bit identifies the character as having a matching code in the train image field.
Inventors
- 👤 J Gregor
- 👤 R Radlinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:24
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/08; B; B41; B41J; B41J29/00; B41J29/38; B41J29/393
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
221 words
Printer apparatus comprising the combination with a print mechanism having a type train with a plurality of type characters movable past print positions on a document for printing on said document, and hammer means operable to impact said document and type characters to print characters on said document, first storage means storing coded representations of characters to be printed by said printer apparatus, and second storage means storing representations of characters in said type train, wherein the improvement comprises third storage means storing an associative bit at a different address represented by the numerical value of the bits of the coded representation for each different character loaded into said second storage means, a register connected to said first storage means for loading coded representations of characters to be printed into said first storage means, circuit means connecting said regIster to said third storage means to directly access a particular address in said third storage means represented by the value of a coded representation in said register to detect if said coded representation is a valid character on said type train and has an associative bit stored at said particular address, and means connecting said first storage means and said second storage means for controlling said hammer means to print characters on said document having coded representations in said first storage means.
Claim 2
Dependent Claim
221 words
Printer apparatus comprising the combination with a print mechanism having a type train with a plurality of type characters movable past print positions on a document for printing on said document, and hammer means operable to impact said document and type characters to print characters on said document, first storage means storing coded representations of characters to be printed by said printer apparatus, and second storage means storing representations of characters in said type train, wherein the improvement comprises third storage means storing an associative bit at a different address represented by the numerical value of the bits of the coded representation for each different character loaded into said second storage means, a register connected to said first storage means for loading coded representations of characters to be printed into said first storage means, circuit means connecting said regIster to said third storage means to directly access a particular address in said third storage means represented by the value of a coded representation in said register to detect if said coded representation is a valid character on said type train and has an associative bit stored at said particular address, and means connecting said first storage means and said second storage means for controlling said hammer means to print characters on said document having coded representations in said first storage means.
Claim 3
Dependent Claim
21 words
The invention as defined in claim 1 characterized by said third storage means comprising a portion of said first storage means.
Claim 4
Dependent Claim
50 words
The invention as defined in claim 2 characterized by each portion of said third storage means having a plurality of bit positions, and the bits of said coded representations used to detect said particular address in said third storage means comprising less than all of said plurality of bit positions.
Claim 5
Dependent Claim
41 words
The invention as defined in claim 3 characterized by a predetermined number of bits of said coded representations in different addresses in said third storage means being used to designate different classes of characters being loaded into said second storage means.
Claim 6
Dependent Claim
43 words
The invention as defined in claim 4 characterized by the associative bit at each particular address being stored in a different bit position in said third storage means dependent on the different class of character on the type train it is associated with.
Claim 7
Dependent Claim
45 words
The invention as defined in claim 5 characterized by compare means connected to said third storage means and to said register to check the presence and class designation of the associative bit in said third storage means with that of said character in said register.
Claim 8
Dependent Claim
75 words
The invention as defined in claim 6 characterized by said circuit means connecting said register to said third storage means including means responsive to a Write Command to add a predetermined count to address means of said first storage means to force a predetermined address upon the value of the bits in the coded representation of a character in said register to access the particular address of the associative bit in said third storage means.
Claim 9
Dependent Claim
69 words
The invention as defined in claim 7 characterized by said circuit means connected to address said first storage means and said third storage means portion of said first storage means, said circuit means being also connected to said register and including inverter means connected to inhibit addressing positions of said first storage means generally when accessing an address of said third storage means portion of said first storage means.
Claim 10
Dependent Claim
66 words
The invention as defined in claim 8 characterized by said circuit means connecting said register to said third storage means portion of said first storage means being connected to respond to a Write Command signal to add a predetermined count to force said predetermined address in said third storage means portion of said first storage means and inhibit accessing other portions of said first storage means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |