US4027309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink jet printer apparatus and method of printing
Assignee: International Business Machines Corp
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Filing: 1976-04-28
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Granted: 1977-05-31
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Expires: 1996-04-28
Abstract
Abstract An ink jet printer apparatus and method using ink carrying magnetizable particles, the ink being passed as a stream of droplets sequentially through an electromagnetic field and an electrostatic field, in that order. The droplets are selectively charged electrostatically. All drops are subjected to a time dependent magnetic flux field which effects scans of the drops at a recording surface. Drops not to be used are deflected by electrostatic deflection plates to a gutter.
Inventors
- 👤 Donald Franklin Manning
- 👤 Bruce Allen Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:36
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/07; B41J2/075; B41J2/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
a method of controlling the flight of liquid drops comprising the steps of generating a stream of drops of electrically conductive magnetizable liquid along a path toward an impacting surface; inducing electrical charges on selected ones of said drops; creating a variable magnetic force field of nonuniform flux density across said path to urge deflection of a series of said drops from said path to impact said surface along a line; and establishing an electrostatic force field across said path for deflection of said charged drops from said path along a discard trajectory.
Claim 2
Independent Claim
93 words
a method of controlling the flight of liquid drops comprising the steps of generating a stream of drops of electrically conductive magnetizable liquid along a path toward an impacting surface; inducing electrical charges on selected ones of said drops; creating a variable magnetic force field of nonuniform flux density across said path to urge deflection of a series of said drops from said path to impact said surface along a line; and establishing an electrostatic force field across said path for deflection of said charged drops from said path along a discard trajectory.
Claim 3
Dependent Claim
19 words
a method as claimed in claim 1, including the further steps of collecting the drops in said discard trajectory.
Claim 4
Dependent Claim
27 words
A method as claimed in claim 1 wherein the deflection of said drops in said electrostatic field is orthogonal to the deflection produced in said magnetic field.
Claim 5
Dependent Claim
26 words
A method as claimed in claim 3 in which the deflection in said magnetic field is horizontal and the deflection in said electrostatic field is vertical.
Claim 6
Dependent Claim
110 words
Apparatus for ink jet printing comprising, in combination, drop generating means for projecting a sequence of uniformly spaced drops of magnetizable ink in a path toward a recording medium drop charging means for inducing an electrical charge on selected ones of said drops, magnetic deflection means for creating a variable magnetic force field of nonuniform flux density across said path to urge deflection of a series of said drops from said path to impact said surface along a line, and electrostatic deflection means following said magnetic deflection means for establishing an electrostatic force field across said path for deflection of said charged drops from said path along a discard trajectory.
Claim 7
Dependent Claim
110 words
Apparatus for ink jet printing comprising, in combination, drop generating means for projecting a sequence of uniformly spaced drops of magnetizable ink in a path toward a recording medium drop charging means for inducing an electrical charge on selected ones of said drops, magnetic deflection means for creating a variable magnetic force field of nonuniform flux density across said path to urge deflection of a series of said drops from said path to impact said surface along a line, and electrostatic deflection means following said magnetic deflection means for establishing an electrostatic force field across said path for deflection of said charged drops from said path along a discard trajectory.
Claim 8
Dependent Claim
28 words
Apparatus as claimed in claim 5, in which the fields established by said magnetic deflection means and said electrostatic deflection means are orthogonal with respect to each other.
Claim 9
Dependent Claim
31 words
Apparatus as claimed in claim 5 in which the deflection of said drops in said magnetic field is horizontal and the deflection of said drops in said electrostatic field is vertical.
Claim 10
Dependent Claim
18 words
Apparatus as claimed in claim 5 further including collector means for collecting drops traveling in said discard trajectory.
References Cited (Backward Citations)
US3864692A
Cited
US3992712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |