US3574344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blending of particulate materials in predetermined quantities
Assignee: Dow Chemical Co
•
Filing: 1969-07-07
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Granted: 1971-04-13
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Expires: 1989-07-07
Abstract
Abstract Pigments in a polymer particle are blended in predetermined quantities employing two weighing hoppers. The hopper weighing the larger particle size material is discharged through the hopper weighing the smaller particle size material, thereby eliminating ''''hangup'''' or adherence of the finer material to the weighing hopper.
Inventors
- 👤 Theodore C Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:37
CPC Classifications
B; B01; B01F; B01F35/00; B01F35/80; B01F35/88; B01F35/881
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
17 words
The method of claim 1 wherein the first particulate material is a synthetic resin in granular form.
Claim 2
Dependent Claim
19 words
The method of claim 2 wherein the second particulate material is a pigment in the form of a powder.
Claim 3
Independent Claim
148 words
An apparatus for the weighing and blending of a first particulate material with a second particulate material, the apparatus comprising in cooperative combination: a first supply means adapted to supply a first particulate material; a first material weighing means adapted to weigh predetermined quantity of the first partiCulate material; a second particulate material supply means adapted to supply a second particulate material; a second particulate material weighing means adapted to weigh a predetermined quantity of a second particulate material; first and second discharge means in operative association with the first and second weighing means; a mixing means adapted to receive material from a second discharge means, the first discharge means adapted to discharge material from the first weighing means into the second weighing means, the second discharge means adapted to discharge material into the mixing means, whereby the first and second materials are discharged to the mixing means.
Claim 4
Dependent Claim
16 words
The apparatus of claim 4 including means to simultaneously open the first and second discharge means.
Claim 5
Dependent Claim
33 words
The apparatus of claim 4 including means to prevent discharge of the first and second weighing means until a predetermined quantity of material is present in both the first and second weighing means.
Claim 6
Dependent Claim
32 words
The apparatus of claim 4 including means to sequentially activate the first and second supply means, first and second discharge means, mixing means and mixing discharge means on a fixed time cycle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |