US4906249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terpolymer composition with bound indicator dye for fiber optic probe
Assignee: Medtronic Inc
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Filing: 1989-02-23
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Granted: 1990-03-06
•
Expires: 2009-02-23
Abstract
Abstract An improved pH probe based on fiber optics and a unique cross-linked terpolymer of methacrylamidopropyl-trimethyl ammonium chloride, sodium acrylamidopropane sulfonate, and acrylamide, the terpolymer having bound thereto an indicator dye.
Inventors
- 👤 Eric Fogt
- 👤 Linda Cahalan
- 👤 Cheryl Feia
- 👤 Jeff Schweitzer
- 👤 Pat Cahalan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:22
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/84; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0041; C09; C09B; C09B69/00; C09B69/10; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/80; G01N21/7703
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
30 words
As a composition of matter, a cross-linked trimonomer copolymer consisting essentially of methacrylamidopropyl-trimethyl ammonium chloride (MAPTAC), sodium acrylamidopropane sulfonate (NaAMPS) and acrylamide, the copolymer having bound thereto an indicator dye.
Claim 2
Dependent Claim
30 words
As a composition of matter, a cross-linked trimonomer copolymer consisting essentially of methacrylamidopropyl-trimethyl ammonium chloride (MAPTAC), sodium acrylamidopropane sulfonate (NaAMPS) and acrylamide, the copolymer having bound thereto an indicator dye.
Claim 3
Dependent Claim
13 words
The composition of claim 1 in which the indicator dye is phenol red.
Claim 4
Dependent Claim
13 words
The composition of claim 1 in which the cross-linking agent is methylenebisacrylamide (MBA).
Claim 5
Dependent Claim
14 words
The composition of claim 1 in which the dye is a pH indicator type.
Claim 6
Dependent Claim
36 words
The composition of claim 1 in which the copolymer is composed of substantially equal quantities of methacrylamidopropyl-trimethyl ammonium chloride (MAPTAC) and sodium acrylamidopropane sulfonate (NaAmps) together in prodominant amount, the acrylamide being included in lesser amount.
Claim 7
Dependent Claim
46 words
The composition of claim 5 in which the substantially equal amouns of methaacrylamidopropyl-trimethyl ammonium chloride (MAPTAC) and sodiumacrylamidopropane sulfonate (NaAmps) are present in an amount together of 80-95% by weight in the copolymer and the acrylamide is present in an amount of about 20-5% by weight.
Claim 8
Dependent Claim
16 words
The composition of claim 6 in which the stated amounts are about 90% and 10%, respectively.
Claim 9
Dependent Claim
16 words
The composition of claim 6 in which the stated amounts are about 95% and 5%, respectively.
Claim 10
Dependent Claim
24 words
The composition of claim 1 in which the amount of dye bound to the copolymer is from about 0.1% to about 3% by weight.
Claim 11
Dependent Claim
20 words
The composition of claim 1 in which the amount of dye bound to the copolymer is about 1-2% by weight.
Claim 12
Dependent Claim
17 words
The composition of any one of the preceding claims in the combination with a fiber optic probe.
Claim 13
Dependent Claim
13 words
The composition of claim 11 in which the probe is a pH probe.
References Cited (Backward Citations)
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Cited
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US4194877A
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US4200110A
Cited
US4622356A
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US4476870A
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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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |