Patent US5770028A successfully refreshed from Google Patents.
US5770028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glucose and lactate sensors
Assignee: Siemens Healthcare Diagnostics Inc
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Filing: 1996-12-19
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Granted: 1998-06-23
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Expires: 2016-12-19
Abstract
Abstract A solid state, multi-use electrochemical sensor having an electrically nonconductive substrate, a working electrode, and a semi-permeable membrane covering the working electrode. The working electrode includes an electrically conductive material adhered to a portion of the substrate. A first portion of the conductive material is covered with an electrically insulating dielectric coating, and a second portion of the conductive material is covered with an active layer. The active layer includes a catalytically active quantity of an enzyme carried by platinized carbon powder particles, which are distributed throughout the active layer. A sensor package for incorporating a sensor is provided.
Inventors
- 👤 Thomas C. Maley
- 👤 Mark W. Boden
- 👤 Paul A. D'Orazio
- 👤 Peter G. Edelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:05
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; C; C12; C12Q; C12Q1/00; C12Q1/001; C12Q1/005; C12Q1/006; Y; Y10; Y10S; Y10S435/00; Y10S435/817; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/53; Y10T29/5313; Y10T29/53261; Y10T29/53265
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
50 words
A reference electrode, comprising: a substrate layer: a cellulose acetate layer, formed from screen printing a paste which comprises: (a) cellulose acetate; and (b) an aprotic solvent, said paste having a viscosity of from about 40,000 centipose to about 350,000 centipoise; and a membrane disposed over said cellulose acetate layer.
Claim 2
Dependent Claim
50 words
A reference electrode, comprising: a substrate layer: a cellulose acetate layer, formed from screen printing a paste which comprises: (a) cellulose acetate; and (b) an aprotic solvent, said paste having a viscosity of from about 40,000 centipose to about 350,000 centipoise; and a membrane disposed over said cellulose acetate layer.
Claim 3
Dependent Claim
19 words
The reference electrode according to claim 1, further comprising a silver-silver chloride layer disposed beneath said cellulose acetate layer.
Claim 4
Dependent Claim
22 words
The reference electrode according to claim 2, wherein said silver-silver chloride layer is disposed between said substrate and said cellulose acetate layer.
Claim 5
Dependent Claim
29 words
The reference electrode according to claim 1, wherein said paste comprises from about 15 grams to about 35 grams of cellulose acetate for every 100 mL of said solvent.
Claim 6
Dependent Claim
24 words
The reference electrode according to claim 1, wherein said paste comprises about 20 grams of cellulose acetate for every 100 mL of said solvent.
Claim 7
Dependent Claim
17 words
The reference electrode according to claim 1, further comprising a dielectric layer supported by said substrate layer.
Claim 8
Dependent Claim
19 words
The reference electrode according to claim 1, wherein said silver-silver chloride layer is disposed beneath said cellulose acetate layer.
Claim 9
Dependent Claim
17 words
The reference electrode according to claim 7, further comprising a dielectric layer supported by said substrate layer.
Claim 10
Dependent Claim
74 words
A reference electrode, comprising: a substrate layer: a dielectric layer supported by said substrate layer: a silver-silver chloride layer supported by said substrate layer: a membrane supported by said substrate layer: and a cellulose acetate layer supported by said substrate layer, said cellulose acetate layer being formed from a cellulose acetate paste, comprising: (a) cellulose acetate; and (b) a solvent, said paste having a viscosity of from about 40,000 centipoise to about 350,000 centipoise.
Claim 11
Dependent Claim
74 words
A reference electrode, comprising: a substrate layer: a dielectric layer supported by said substrate layer: a silver-silver chloride layer supported by said substrate layer: a membrane supported by said substrate layer: and a cellulose acetate layer supported by said substrate layer, said cellulose acetate layer being formed from a cellulose acetate paste, comprising: (a) cellulose acetate; and (b) a solvent, said paste having a viscosity of from about 40,000 centipoise to about 350,000 centipoise.
Claim 12
Dependent Claim
23 words
The reference electrode according to claim 9, wherein said silver-silver chloride layer is disposed between said substrate layer and said cellulose acetate layer.
Claim 13
Dependent Claim
17 words
The reference electrode according to claim 10, wherein said membrane is disposed over said cellulose acetate layer.
Claim 14
Dependent Claim
17 words
The reference electrode according to claim 9, wherein said membrane is disposed over said cellulose acetate layer.
Claim 15
Dependent Claim
29 words
The reference electrode sensor according to claim 12, wherein said paste comprises from about 15 grams to about 35 grams of cellulose acetate for every 100 mL of solvent.
Claim 16
Dependent Claim
19 words
The reference electrode according to claim 9, wherein said silver-silver chloride layer is disposed beneath said cellulose acetate layer.
Claim 17
Dependent Claim
17 words
The reference electrode according to claim 14, wherein said membrane is disposed over said cellulose acetate layer.
Claim 18
Dependent Claim
86 words
A process for forming a reference electrode the process comprising the steps of: (a) providing a substrate layer, a dielectric layer supported by said substrate layer, a conductive strip supported by said substrate layer, and a silver-silver chloride layer supported by said conductive strip: (b) forming a paste by mixing cellulose acetate with a solvent; (c) forming a cellulose acetate layer by screen printing said paste on said silver-silver chloride layer; and (d) disposing a membrane over said cellulose acetate layer to provide said reference electrode.
Claim 19
Dependent Claim
86 words
A process for forming a reference electrode the process comprising the steps of: (a) providing a substrate layer, a dielectric layer supported by said substrate layer, a conductive strip supported by said substrate layer, and a silver-silver chloride layer supported by said conductive strip: (b) forming a paste by mixing cellulose acetate with a solvent; (c) forming a cellulose acetate layer by screen printing said paste on said silver-silver chloride layer; and (d) disposing a membrane over said cellulose acetate layer to provide said reference electrode.
Claim 20
Dependent Claim
17 words
The process accoridng to claim 16, wherein step (b) includes mixing cellulose acetate with an aprotic solvent.
Claim 21
Dependent Claim
33 words
The process according to claim 16, wherein step (b) includes mixing said cellulose acetate with said solvent to form a paste having a viscosity of from about 40,000 centipoise to about 350,000 centipoise.
Claim 22
Dependent Claim
19 words
The process according to claim 16, wherein said step (a) includes disposing said dielectric layer on said substrate layer.
Claim 23
Dependent Claim
25 words
The process according to claim 16, wherein said step (a) includes disposing said silver-silver chloride layer between said cellulose acetate layer and said substrate layer.
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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) | 2001-06-22 | 2001-12-22 | 2002-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-22 | 2005-12-22 | 2006-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-22 | 2009-12-22 | 2010-06-23 | $7700.00 | Window Closed / Lapsed |