US3932194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Milled talc material and milling method
Assignee: CELITE Corp
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Filing: 1974-02-11
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Granted: 1976-01-13
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Expires: 1994-02-11
Abstract
Abstract Milled talc materials containing about twenty to about thirty-five weight percent tremolite having particle size distributions such that no more than five percent of the particles are larger than 10 microns, no more than 12 percent of the particles are larger than five microns and no more than 15 percent of the particles are smaller than 0.3 microns in equivalent spherical diameter have improved opacifying properties for use in paper, rubber, plastics and paint manufacture. The materials can be obtained by jet or fluid energy milling and by controlling the milling variables to produce particle size distributions within the critical range.
Inventors
- 👤 Richard Seyb Lamar
- 👤 Norman Bach Scheffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:15
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/62
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
61 words
A milled talc material containing about 20 to about 35 percent tremolite having a particle size distribution such that no more than 5% of the particles are larger than 10 microns, no more than 12% of the particles are larger than 5 microns and no more than 15 percent of the particles are smaller than 0.3 microns in equivalent spherical diameter.
Claim 2
Dependent Claim
61 words
A milled talc material containing about 20 to about 35 percent tremolite having a particle size distribution such that no more than 5% of the particles are larger than 10 microns, no more than 12% of the particles are larger than 5 microns and no more than 15 percent of the particles are smaller than 0.3 microns in equivalent spherical diameter.
Claim 3
Dependent Claim
22 words
A milled talc material according to claim 1 wherein no more than 5 percent of the particles are larger than 5 microns.
Claim 4
Dependent Claim
22 words
A milled talc material according to claim 1 wherein no more than 12 percent of the particles are smaller than 0.3 microns.
Claim 5
Dependent Claim
21 words
A milled talc material according to claim 2 wherein no more than 12% of the particles are smaller than 0.3 microns.
Claim 6
Dependent Claim
22 words
A milled talc material according to claim 4 wherein no more than 2 percent of the particles are larger than 5 microns.
Claim 7
Dependent Claim
23 words
A milled talc material according to claim 5 wherein about 5 to about 12 percent of the particles are smaller than 0.3 microns.
Claim 8
Dependent Claim
20 words
A milled talc material according to claim 6 wherein the tremolite content of the talc material is about 30 percent.
Claim 9
Dependent Claim
20 words
A milled talc material according to claim 4 wherein the tremolite content of the talc material is about 30 percent.
Claim 10
Dependent Claim
96 words
In a process of milling a talc material containing tremolite to obtain a finely divided pigment, the improvement comprising jet or fluid energy milling a talc material containing about 20 to about 35 percent tremolite and controlling the milling variables to produce a milled product having a particle size distribution such that no more than 5 percent of the particles are larger than 10 microns, no more than 12 percent of the particles are larger than 5 microns and no more than 15 percent of the particles are smaller than 0.3 microns in equivalent spherical diameter.
Claim 11
Dependent Claim
96 words
In a process of milling a talc material containing tremolite to obtain a finely divided pigment, the improvement comprising jet or fluid energy milling a talc material containing about 20 to about 35 percent tremolite and controlling the milling variables to produce a milled product having a particle size distribution such that no more than 5 percent of the particles are larger than 10 microns, no more than 12 percent of the particles are larger than 5 microns and no more than 15 percent of the particles are smaller than 0.3 microns in equivalent spherical diameter.
Claim 12
Dependent Claim
20 words
A method according to claim 9 wherein no more than 5 percent of the particles are larger than 5 microns.
Claim 13
Dependent Claim
19 words
A method according to claim 10 wherein no more than 12 percent of particles are smaller than 0.3 microns.
Claim 14
Dependent Claim
20 words
A method according to claim 11 wherein no more than 2 percent of the particles are larger than 5 microns.
Claim 15
Dependent Claim
21 words
A method according to claim 12 wherein about 5 to about 12 percent of the particles are smaller than 0.3 microns.
Claim 16
Dependent Claim
17 words
A method according to claim 13 wherein the tremolite content of the talc material is about 30%.
Claim 17
Dependent Claim
17 words
A method according to claim 11 wherein the tremolite content of the talc material is about 30%.
References Cited (Backward Citations)
US3366501A
Cited
US3643875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |