US5143967A
Expired / Lapsed
US
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Frequency sensitive conductive rubber composition
Assignee: Goodyear Tire and Rubber Co
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Filing: 1991-03-27
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Granted: 1992-09-01
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Expires: 2011-03-27
Abstract
Abstract A sulfur cured rubber composition composed of selected natural rubber and carbon black for sensing pressure with reference to applied sinusoidal electrical energy.
Inventors
- 👤 Ram M. Krishnan
- 👤 Chia-Li Sun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:23
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C1/00; B60C1/0008; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
A sulfur cured rubber composition characterized by exhibiting a substantially linear, positively sloped, curve of log conductivity (ohm -1 cm -1 ) versus applied pressure to the said rubber composition for an applied sinusoidal electrical energy having a frequency in the range of about 10 Hz to about 500 kHz; wherein said rubber composition is comprised of (1) 100 parts by weight natural rubber of grade SMR 5CV purity or better, and, homogeneously dispersed therein, (2) about 30 to about 45 parts by weight of at least one carbon black having a surface area characterized by an iodine absorption number in a range of about 220 to about 300 a relatively high structure characterized by a dibutylphathalate value in a range of about 150 to about 210 and a particle size of an average in the range of about 20 to about 50 nanometers.
Claim 2
Dependent Claim
144 words
A sulfur cured rubber composition characterized by exhibiting a substantially linear, positively sloped, curve of log conductivity (ohm -1 cm -1 ) versus applied pressure to the said rubber composition for an applied sinusoidal electrical energy having a frequency in the range of about 10 Hz to about 500 kHz; wherein said rubber composition is comprised of (1) 100 parts by weight natural rubber of grade SMR 5CV purity or better, and, homogeneously dispersed therein, (2) about 30 to about 45 parts by weight of at least one carbon black having a surface area characterized by an iodine absorption number in a range of about 220 to about 300 a relatively high structure characterized by a dibutylphathalate value in a range of about 150 to about 210 and a particle size of an average in the range of about 20 to about 50 nanometers.
Claim 3
Dependent Claim
25 words
The sulfur cured rubber composition of claim 1 which is primary sensitive to changes in such electrical conductivity with minimal influence to external temperature variations.
References Cited (Backward Citations)
US4098968A
Cited
US4534889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |