US3974260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desensitized free-flowing red phosphorus
Assignee: Hoechst AG
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Filing: 1973-10-04
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Granted: 1976-08-10
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Expires: 1993-10-04
Abstract
Abstract Desensitized free-flowing red phosphorus. The phosphorus is comprised of a homogeneous blend consisting of between about 80 and 98 weight% of red phosphorus having a particle size of up to about 2 mm, and of between about 2 and 20 weight% of an organic or organo-silicon compound desensitizer. The desensitizer is liquid, inactive with respect to red phosphorus and has a minor vapor pressure at room temperature at atmospheric pressure.
Inventors
- 👤 Joachim Wortmann
- 👤 Franz-Josef Dany
- 👤 Hedwig Prell
- 👤 Joachim Kandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:03
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/003; C01B25/006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
Desensitized non-dusting free-flowing red phosphorus comprising a homogeneous blend consisting of between about 80 and 98 weight % of red phosphorus having a particle size of up to about 2 mm, and of between about 2 and 20 weight % of a desensitizer compound selected from the group consisting of a chlorinated paraffin oil containing between about 30 and 70 weight % of chlorine and having a viscosity of between about 100 and 15,000 centipoises at 18°C., tris-(β-chloroethyl)-phosphate, tricresylphosphate, a silicon-polyether block copolymer having a viscosity at 25°C. of 1,000 - 1,500 centistoke, a density at 25°C. of 1.04 and a refractive index at 25°C. of 1.445 - 1,448 and a copolymer of dimethylpolysiloxane and polyoxyalkylene ether having a viscosity at 25°C of 1,200 to 1,500 cS, a specific gravity at 20°C. of 1.04 and a hydroxyl number of 4-6 mg KOH/g.
Claim 2
Dependent Claim
142 words
Desensitized non-dusting free-flowing red phosphorus comprising a homogeneous blend consisting of between about 80 and 98 weight % of red phosphorus having a particle size of up to about 2 mm, and of between about 2 and 20 weight % of a desensitizer compound selected from the group consisting of a chlorinated paraffin oil containing between about 30 and 70 weight % of chlorine and having a viscosity of between about 100 and 15,000 centipoises at 18°C., tris-(β-chloroethyl)-phosphate, tricresylphosphate, a silicon-polyether block copolymer having a viscosity at 25°C. of 1,000 - 1,500 centistoke, a density at 25°C. of 1.04 and a refractive index at 25°C. of 1.445 - 1,448 and a copolymer of dimethylpolysiloxane and polyoxyalkylene ether having a viscosity at 25°C of 1,200 to 1,500 cS, a specific gravity at 20°C. of 1.04 and a hydroxyl number of 4-6 mg KOH/g.
Claim 3
Dependent Claim
17 words
Red phosphorus as claimed in claim 1, the blend containing between 4 and 10 weight% of desensitizer.
Claim 4
Dependent Claim
21 words
Red phosphorus as claimed in claim 1, the desensitized red phosphorus having a particle size between about 0.0001 and 0.1 mm.
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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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |