US5079570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capillary reservoir binary ink level sensor
Assignee: HP Inc
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Filing: 1989-10-18
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Granted: 1992-01-07
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Expires: 2009-10-18
Abstract
Abstract An ink level sensor (18, 18', 18") is provided for detecting the level of ink in an ink cartridge (10) containing a capillary reservoir (14), such as foam, therein. The ink level sensor is a binary fluidic indicator, which provides both a human and machine readable indication of the level of the ink. A plurality of embodiments are described, including a two-port sensor (20), a one-port sensor (22), and a pair of fluidically-connected needles of different length (24).
Inventors
- 👤 John A. Mohr
- 👤 Michael B. Lloyd
- 👤 Scott W. Hock
- 👤 Mindy A. Hamlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:36
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/175; B41J2/17566; G; G01; G01F; G01F23/00; G01F23/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
133 words
In a device for dispensing a fluid stored in a capillary reservoir comprising a housing within which said capillary reservoir is contained for storing a quantity of liquid and on one end of which is mounted a means fluidically connected with said reservoir for dispensing said liquid, the improvement comprising at least one binary liquid level sensor mounted on said housing above said dispensing means and fluidically communicating with said capillary reservoir, wherein at least one of said binary liquid level sensor comprises a transparent C-shaped tube mounted on a side of said housing, with an upper port a first distance above said dispensing means and a lower port a second distance above said dispensing means, said second distance shorter that said first distance, both said ports fluidically communicating with said capillary reservoir.
Claim 2
Dependent Claim
133 words
In a device for dispensing a fluid stored in a capillary reservoir comprising a housing within which said capillary reservoir is contained for storing a quantity of liquid and on one end of which is mounted a means fluidically connected with said reservoir for dispensing said liquid, the improvement comprising at least one binary liquid level sensor mounted on said housing above said dispensing means and fluidically communicating with said capillary reservoir, wherein at least one of said binary liquid level sensor comprises a transparent C-shaped tube mounted on a side of said housing, with an upper port a first distance above said dispensing means and a lower port a second distance above said dispensing means, said second distance shorter that said first distance, both said ports fluidically communicating with said capillary reservoir.
Claim 3
Dependent Claim
32 words
The improvement of claim 1 comprising a plurality of said transparent tubes, spaced one above the other so as to provide a progressive indication of extent of emptiness of said capillary reservoir.
Claim 4
Dependent Claim
130 words
In a device for dispensing a fluid stored in a capillary reservoir comprising a housing within which said capillary reservoir is contained for storing a quantity of liquid and on one end of which is mounted a means fluidically connected with said reservoir for dispensing said liquid, the improvement comprising at least one binary liquid level sensor mounted on said housing above said dispensing means and fluidically communicating with said capillary reservoir, wherein at least one of said binary liquid level sensor comprises a plurality of transparent buttons mounted on a side of said housing above said dispensing means, said transparent buttons fluidically communicating with said capillary reservoir and spaced one above the other so as to provide a progressive indication of the extent of emptiness of said capillary reservoir.
Claim 5
Dependent Claim
130 words
In a device for dispensing a fluid stored in a capillary reservoir comprising a housing within which said capillary reservoir is contained for storing a quantity of liquid and on one end of which is mounted a means fluidically connected with said reservoir for dispensing said liquid, the improvement comprising at least one binary liquid level sensor mounted on said housing above said dispensing means and fluidically communicating with said capillary reservoir, wherein at least one of said binary liquid level sensor comprises a plurality of transparent buttons mounted on a side of said housing above said dispensing means, said transparent buttons fluidically communicating with said capillary reservoir and spaced one above the other so as to provide a progressive indication of the extent of emptiness of said capillary reservoir.
Claim 6
Dependent Claim
109 words
In a device for dispensing a fluid stored in a capillary reservoir comprising a housing within which said capillary reservoir is contained for storing a quantity of liquid and on one end of which is mounted a means fluidically connected with said reservoir for dispensing said liquid, the improvement comprising at least one binary liquid level sensor mounted on said housing above said dispensing means and fluidically communicating with said capillary reservoir, wherein at least one of said binary liquid level sensor comprises a pair of needle-like members of different lengths extending into said capillary reservoir and fluidically connected above said capillary reservoir by means of a transparent tube.
Claim 7
Dependent Claim
109 words
In a device for dispensing a fluid stored in a capillary reservoir comprising a housing within which said capillary reservoir is contained for storing a quantity of liquid and on one end of which is mounted a means fluidically connected with said reservoir for dispensing said liquid, the improvement comprising at least one binary liquid level sensor mounted on said housing above said dispensing means and fluidically communicating with said capillary reservoir, wherein at least one of said binary liquid level sensor comprises a pair of needle-like members of different lengths extending into said capillary reservoir and fluidically connected above said capillary reservoir by means of a transparent tube.
Claim 8
Dependent Claim
35 words
The improvement of claim 4 comprising a plurality of said pairs of needle-like members, each pair having lengths different from other pairs to provide a progressive indication of extent of emptiness of said capillary reservoir.
Claim 9
Dependent Claim
78 words
In a device for dispensing a fluid stored in a capillary reservoir comprising a housing within which said capillary reservoir is contained for storing a quantity of liquid and on one end of which is mounted a means fluidically connected with said reservoir for dispensing said liquid, the improvement comprising at least one binary liquid level sensor mounted on said housing above said dispensing means and fluidically communicating with said capillary reservoir, wherein said capillary reservoir comprises foam.
Claim 10
Dependent Claim
78 words
In a device for dispensing a fluid stored in a capillary reservoir comprising a housing within which said capillary reservoir is contained for storing a quantity of liquid and on one end of which is mounted a means fluidically connected with said reservoir for dispensing said liquid, the improvement comprising at least one binary liquid level sensor mounted on said housing above said dispensing means and fluidically communicating with said capillary reservoir, wherein said capillary reservoir comprises foam.
References Cited (Backward Citations)
US3708798A
Cited
US4015272A
Cited
US4376490A
Cited
US4380772A
Cited
US4604633A
Cited
US4610202A
Cited
US4607266A
Cited
US4771295A
Cited
US4771295B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |