Patent US4956653A successfully refreshed from Google Patents.
US4956653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bubble jet print head having improved multi-layer protective structure for heater elements
Assignee: Eastman Kodak Co
•
Filing: 1989-05-12
•
Granted: 1990-09-11
•
Expires: 2009-05-12
Abstract
Abstract An improved protective construction for a bubble jet print head device of the kind having a substrate with a plurality of separately addressable resistive heater portions that are formed by address and common electrodes. The protective construction includes a first layer of dielectric material formed over the heater portions, a second layer of metal formed over the first layer, and a third layer having a physically hard and chemically inert outer surface portion overlying the second layer.
Inventors
- 👤 Hilarion Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:08
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2/14088; B41J2/14112; B41J2/14129; B41J2202/00; B41J2202/01; B41J2202/03
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
132 words
In a bubble jet print head device of the kind having a substrate with a plurality of separately addressable resistive heater portions that are formed by address and common electrode pairs that provide electrical energy flow to and away from spaced edges of such heater portions, an improved protective cover construction for such heater portions comprising: (a) a first layer of dielectric material formed on said heater portions; (b) shielding meand, including a second layer of metal formed on said first layer and overlying said electrode pairs and said heater portions, for shielding a subsequently overlying layers(s) from localized electrical fields of said electrode pairs; and (c) a third layer having a physically hard, scratch resistant and chemically inert outer surface portion overlying said first and second layers and said heater portions.
Claim 2
Dependent Claim
132 words
In a bubble jet print head device of the kind having a substrate with a plurality of separately addressable resistive heater portions that are formed by address and common electrode pairs that provide electrical energy flow to and away from spaced edges of such heater portions, an improved protective cover construction for such heater portions comprising: (a) a first layer of dielectric material formed on said heater portions; (b) shielding meand, including a second layer of metal formed on said first layer and overlying said electrode pairs and said heater portions, for shielding a subsequently overlying layers(s) from localized electrical fields of said electrode pairs; and (c) a third layer having a physically hard, scratch resistant and chemically inert outer surface portion overlying said first and second layers and said heater portions.
Claim 3
Dependent Claim
18 words
The invention defined in claim 1 wherein said outer surface portion of said third layer is a carbide.
Claim 4
Dependent Claim
31 words
The invention defined in claim 2 wherein said third layer comprises a silicon carbide outer surface portion and a silicon nitride portion attaching said outer surface portion and said metal layer.
Claim 5
Dependent Claim
13 words
The invention defined in claim 3 wherein said first layer comprises silicon nitride.
Claim 6
Dependent Claim
13 words
The invention defined in claim 4 wherein said metal layer is tantalum aluminide.
Claim 7
Dependent Claim
29 words
The invention defined in claim 1 wherein said first layer is about 2.0 to 6.O kÅ in thickness, said second layer is about 1.0 to 6.0 kÅ in thickness.
Claim 8
Dependent Claim
18 words
The invention defined in claim 6 wherein said third layer is about 1.5 to 3.0 kÅ in thickness.
Claim 9
Dependent Claim
36 words
The invention defined in claim 7 wherein said third layer comprises an outer portion of silicon carbide about 1-2 kÅ in thickness and an inner portion of silicon nitride about 0.5 to 1 kÅ in thickness.
Claim 10
Dependent Claim
128 words
In a bubble jet print head device of the kind having a substrate with a plurality of separately addressable resistive heater portions that are formed by address and common electrode pairs that provide electrical energy flow to and away from spaced edges of such heater portions, an improved protective cover construction for such heater portions comprising: (a) a first layer of silicon nitride having a thickness of about 2.0 to 6.0 kÅ formed on said heater portions; (b) a second layer of TaAl 3 having a thickness of about 1.0 to 6.0 KÅ formed on said first layer and overlying said heater portions; and (c) a third layer having a physically hard and chemically inert outer surface portion overlying said first and second layers and said heater portions.
Claim 11
Dependent Claim
128 words
In a bubble jet print head device of the kind having a substrate with a plurality of separately addressable resistive heater portions that are formed by address and common electrode pairs that provide electrical energy flow to and away from spaced edges of such heater portions, an improved protective cover construction for such heater portions comprising: (a) a first layer of silicon nitride having a thickness of about 2.0 to 6.0 kÅ formed on said heater portions; (b) a second layer of TaAl 3 having a thickness of about 1.0 to 6.0 KÅ formed on said first layer and overlying said heater portions; and (c) a third layer having a physically hard and chemically inert outer surface portion overlying said first and second layers and said heater portions.
Claim 12
Dependent Claim
18 words
The invention defined in claim 9 wherein said outer surface portion of said third layer is a carbide.
Claim 13
Dependent Claim
31 words
The invention defined in claim 10 wherein said third layer comprises a silicon carbide outer surface portion and a silicon nitride portion attaching said outer surface portion and said metal layer.
References Cited (Backward Citations)
US4335389A
Cited
US4370668A
Cited
US4412224A
Cited
US4450457A
Cited
US4577202A
Cited
US4567493A
Cited
US4596994A
Cited
US4513298A
Cited
US4686544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |