US3927749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for supplementing the operation of the ribbon selecting and backspacing means of a typewriter
Assignee: Individual
•
Filing: 1974-08-12
•
Granted: 1975-12-23
•
Expires: 1994-08-12
Abstract
Abstract A typewriter has two separate ribbons, at least one of which has two printing fields. An attachment for the typewriter has keys, or other manually operable members, selects any desired one of the three ribbon fields and at the same time backspaces the typewriter. The aforesaid arrangement permits one of the ribbon fields to be a ''''correcting'''' field so that the typewriter may be easily operated as a correcting typewriter. A separate feature is that part of the attachment may be in the form of a cassette.
Inventors
- 👤 William H Wolowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:23
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/26; B41J29/36
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
187 words
In a printing machine, printing means including a printing medium having first, second and third printing fields, selecting means for selecting which of said three printing fields will be used at any particular time, said selecting means being movable in first and second opposite directions and having at least first, second and third positions to which it is movable, one for each of said ribbon fields, the second one of said three positions being a midposition and the other two positions being in said first and second opposite directions respectively from the mid-position, said printing means including operable means for performing the printing operation in steps across the object being printed and including backspace means for backspacing the operable means one step, a first key for moving said selecting means in said first direction to said first position to select one of said three fields, means for operating said backspace means when said first key is depressed, and means for selecting either said second or said third position of said selecting means, said means comprising a second key for moving said selecting means in said second direction
Claim 2
Dependent Claim
187 words
In a printing machine, printing means including a printing medium having first, second and third printing fields, selecting means for selecting which of said three printing fields will be used at any particular time, said selecting means being movable in first and second opposite directions and having at least first, second and third positions to which it is movable, one for each of said ribbon fields, the second one of said three positions being a midposition and the other two positions being in said first and second opposite directions respectively from the mid-position, said printing means including operable means for performing the printing operation in steps across the object being printed and including backspace means for backspacing the operable means one step, a first key for moving said selecting means in said first direction to said first position to select one of said three fields, means for operating said backspace means when said first key is depressed, and means for selecting either said second or said third position of said selecting means, said means comprising a second key for moving said selecting means in said second direction
Claim 3
Dependent Claim
21 words
A printing machine as defined in claim 1 including means for operating said backspace means when said second key is depressed.
Claim 4
Dependent Claim
25 words
A printing machine as defined in Claim 1 in which said selecting means and said backspace means are manually operable independently of said control means.
Claim 5
Dependent Claim
69 words
A printing machine as defined in claim 3 in which the printing means, the selecting means, the operable means and the backspace means comprise a typewriter, said two keys comprising an attachment for said typewriter that may be applied thereto without precluding the typist from manually operating the backspace means and without precluding the typist from manually operating said selecting means to select any of the printing ribbon fields.
Claim 6
Dependent Claim
68 words
A printing machine as defined in claim 4 in which said two keys are mounted in a casette, and which includes movable means outside the casette for operating said backspace means, means in the casette which, in response to depression of either key, operates said movable means to in turn operate the backspace means, and means in the casette controlled by said keys for operating said selecting means.
Claim 7
Dependent Claim
48 words
A printing machine as defined in claim 1, in which said means for selecting either said second or said third position includes means operable by the typist to prevent the selecting means from moving past the second position to the third position when the second key is depressed.
Claim 8
Dependent Claim
156 words
An attachment for a typewriter, said typewriter having a keyboard, a ribbon selector at one end of the keyboard, and backspace means including a key that forms a part of the keyboard, comprising: movable means adapted for mounting on the typewriter and which, when so mounted, includes a movable element adjacent said ribbon selector and means operated by given movement of said element for operating the backspace means, and attachment means, adapted to be attached to the typewriter adjacent said ribbon selector, and including first and second keys, said attachment means, when attached to the typewriter adjacent said ribbon selector, also including means for operating said movable element to in turn operate the backspace means when either of said keys is depressed and which insures that after one of said keys is depressed the ribbon selector is in one ribbon selecting position and when the other key is depressed the ribbon-selector is in another ribbon-selecting position.
Claim 9
Dependent Claim
156 words
An attachment for a typewriter, said typewriter having a keyboard, a ribbon selector at one end of the keyboard, and backspace means including a key that forms a part of the keyboard, comprising: movable means adapted for mounting on the typewriter and which, when so mounted, includes a movable element adjacent said ribbon selector and means operated by given movement of said element for operating the backspace means, and attachment means, adapted to be attached to the typewriter adjacent said ribbon selector, and including first and second keys, said attachment means, when attached to the typewriter adjacent said ribbon selector, also including means for operating said movable element to in turn operate the backspace means when either of said keys is depressed and which insures that after one of said keys is depressed the ribbon selector is in one ribbon selecting position and when the other key is depressed the ribbon-selector is in another ribbon-selecting position.
Claim 10
Dependent Claim
70 words
An attachment for a typewriter as defined in claim 7, in which said attachment means comprises means which when attached to the typewriter does not preclude the typist from manually operating the backspace key of the typewriter and also does not preclude the typist from manually operating the ribbon selector to select a desired one of the printing fields of any printing ribbon means that may be on the typewriter.
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |