US5434603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink cartridge with passageway for ink level indicator
Assignee: HP Inc
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Filing: 1992-12-22
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Granted: 1995-07-18
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Expires: 2012-12-22
Abstract
Abstract An ink jet pen supply cartridge having a spring biased ink reservoir with a visual indication of remaining ink quantity. The reservoir tends to collapse laterally as the ink supply decreases due to differential pressure exerted thereto. The spring-reservoir is contained in a rigid cartridge and a pair of flexible tape members are cemented or welded, one to each side of the spring-reservoir, and extend generally parallel toward a narrow end surface of the cartridge at which they overlap and can be viewed through a window. The overlapping relationship of the tape members provide ink quantity indicia which change as the spring-reservoir collapse draws them past each other.
Inventors
- 👤 David S. Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:34
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/175; B41J2/17503; B41J2/17506; B41J2/17513; B41J2/1752; B41J2/17523; B41J2/17553; B41J2/17566; B41J2002/17516; B41J2002/17573; B41J2002/17586
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
An ink cartridge with an ink supply reservoir comprising: an external case member: an internal ink reservoir having a movable portion which moves from a first position when said reservoir is full through an intermediate position when said reservoir is partially empty to a third position when said reservoir is substantially empty; tab means attached at one end to said movable portion of said internal ink reservoir, for indicating the change in amount of ink in said ink reservoir; and guide means attached to said external case member for defining a passageway to receive said tab means, said guide means including a top surface having a window for displaying visual indicia and a bottom surface for supporting said tab means, and wherein said case member includes a frame member having a recess in one direction and a notch in a second direction normal to said first direction for receiving said tab means, said guide means overlying said tab means as said tab means moves along said recess and said notch.
Claim 2
Dependent Claim
170 words
An ink cartridge with an ink supply reservoir comprising: an external case member: an internal ink reservoir having a movable portion which moves from a first position when said reservoir is full through an intermediate position when said reservoir is partially empty to a third position when said reservoir is substantially empty; tab means attached at one end to said movable portion of said internal ink reservoir, for indicating the change in amount of ink in said ink reservoir; and guide means attached to said external case member for defining a passageway to receive said tab means, said guide means including a top surface having a window for displaying visual indicia and a bottom surface for supporting said tab means, and wherein said case member includes a frame member having a recess in one direction and a notch in a second direction normal to said first direction for receiving said tab means, said guide means overlying said tab means as said tab means moves along said recess and said notch.
Claim 3
Dependent Claim
24 words
The ink cartridge of claim 1, wherein said external case member includes slot means for allowing said tab means to move therethrough without interference.
Claim 4
Dependent Claim
56 words
The ink cartridge of claim 1, wherein said reservoir includes first and second moveable portions and said tab means comprises first and second indicator strips respectively attached at one end to said first and second moveable portions, and said frame member has first and second parallel notches for respectively receiving said first and second indicator strips.
Claim 5
Dependent Claim
25 words
The ink cartridge of claim 3, wherein said second indicator strip overlies said first indicator strip, said second indicator strip having a moveable window therein.
Claim 6
Dependent Claim
19 words
The ink cartridge of claim 4, wherein said second indicator strip is the same color as said frame member.
Claim 7
Dependent Claim
40 words
The ink cartridge of claim 5, wherein said guide means has adhesive on the side thereof which is attached to said case member, and means on said side thereof for preventing said adhesive from inhibiting motion of said indicator strips.
References Cited (Backward Citations)
US4016885A
Cited
US4196625A
Cited
US4422084A
Cited
US4415886A
Cited
JPS62204951A
Cited
JPS633957A
Cited
US4935751A
Cited
US5079570A
Cited
US5152427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-17 | 1999-01-16 | 1999-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-17 | 2003-01-16 | 2003-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-17 | 2007-01-16 | 2007-07-18 | $7700.00 | Window Closed / Lapsed |