Patent US3773301A successfully refreshed from Google Patents.
US3773301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing asbestos slurry
Assignee: Dow Chemical Co
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Filing: 1972-06-02
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Granted: 1973-11-20
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Expires: 1992-06-02
Abstract
Abstract The invention is a method of preparing a pumpable slurry of asbestos fibers. The fibers are wetted, then placed into a holding tank, suitable liquid also being placed in the holding tank. The liquid and fibers are then aspirated into an enclosed mixing chamber and air is moved from the holding tank through the liquid and fibers in the mixing tank. The liquid-fiber mixture is then recycled to the holding tank and the aspirating-air movement, recycling procedure repeated several times until the slurry is completely mixed. This slurry preparation method eliminates health hazards, doesn''t break up the asbestos fibers as do bladed mixer devices, and provides a very well mixed slurry.
Inventors
- 👤 G Bergeron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:02
CPC Classifications
B; B01; B01F; B01F33/00; B01F33/40; B01F33/403
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
A method of preparing a slurry containing asbestos fibers comprising: A. Wetting said fibers; B. Adding said wetted fibers and a predetermined amount of liquid to a holding vessel; C. Aspirating said liquid and fibers into a mixing chamber; D. Vigorously bubbling air through said liquid and fibers in said mixing chamber to agitate said liquid and fibers; and E. Returning said liquid and fibers to said holding vessel.
Claim 2
Independent Claim
69 words
A method of preparing a slurry containing asbestos fibers comprising: A. Wetting said fibers; B. Adding said wetted fibers and a predetermined amount of liquid to a holding vessel; C. Aspirating said liquid and fibers into a mixing chamber; D. Vigorously bubbling air through said liquid and fibers in said mixing chamber to agitate said liquid and fibers; and E. Returning said liquid and fibers to said holding vessel.
Claim 3
Dependent Claim
29 words
A method in accordance with claim 1, wherein said liquid and fibers are successively aspirated into said mixing chamber, agitated and returned to said holding vessel for several cycles.
Claim 4
Dependent Claim
18 words
A method in accordance with claim 1, wherein said fibers constitute predetermined amounts of long and short fibers.
Claim 5
Dependent Claim
26 words
A method in accordance with claim 1, wherein said liquid and fibers are returned to said holding vessel by breaking the vacuum resulting from said aspirating.
References Cited (Backward Citations)
US2605084A
Cited
US3202281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |