US3636772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring the friability of particulate solid materials
Assignee: Dow Chemical Co
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Filing: 1970-02-24
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Granted: 1972-01-25
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Expires: 1990-02-24
Abstract
Abstract A method and a device for measuring the friability of particulate solid materials. The device comprises a chamber, having an inlet for gas and an outlet for fractured particles of the solid material in operative connection with means for its vibration. The chamber has a screen horizontally mounted and means for measuring the amount of material which is fractured and passes through the screen when the container is vibrated. In operation, gas is injected through the inlet to force the fractured material through the outlet.
Inventors
- 👤 Harold L Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:33
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/02; G01N15/0272; G01N33/00; G01N33/0091
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
A method for testing the friability of particulate hygroscopic material which comprises: a. placing the material upon a screen having apertures smaller than the particle size of the material while maintaining the screen in a substantially air tight chamber equipped with an inlet for gas and an outlet for particles; b. vibrating the screen while injecting a substantially anhydrous gas through the inlet to move particles which pass through the screen out the outlet; and c. measuring the amount of material which passes through the outlet in a given period of time.
Claim 2
Independent Claim
92 words
A method for testing the friability of particulate hygroscopic material which comprises: a. placing the material upon a screen having apertures smaller than the particle size of the material while maintaining the screen in a substantially air tight chamber equipped with an inlet for gas and an outlet for particles; b. vibrating the screen while injecting a substantially anhydrous gas through the inlet to move particles which pass through the screen out the outlet; and c. measuring the amount of material which passes through the outlet in a given period of time.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the gas is substantially anhydrous.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the material is NaOH or CaCl2.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the chamber is hermetically sealed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |