Patent US3335869A successfully refreshed from Google Patents.
US3335869A
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Method for improving perlite filteraids with a phosphoric agent
Assignee: Honeywell International Inc
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Filing: 1963-11-14
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Granted: 1967-08-15
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Expires: 1983-11-14
Abstract
No abstract record available.
Inventors
- 👤 Kenneth B Hedges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:24
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J20/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD FOR TREATING A PERLITE FILTER-AID HAVING A LOW FLOWRATE TO INCREASE THE FLOWRATE OF SAID FILTER-AID WHICH METHOD INCLUDES THE STEPS OF: PRODUCING A COMMINUTED EXPANDED PERLITE FILTER-AID WETTED WITH AN AQUEOUS SOLUTION CONTAINING AN AQUEOUS SOLVENT AND AT LEAST ONE AGENT OF THE GROUP CONSISTING OF THE OXY ACIDS OF PHOSPHOROUS, AND THEIR SOLUBLE INORGANIC SALTS, SAID AGENT BEING PRESENT IN AN AMOUNT TO PROVIDE BETWEEN ABUT .1% AND 10% OF P2O5 BY WEIGHT OF THE PERLITE TREATED, SAID AQUEOUS SOLVENT BEING PRESENT IN AN AMOUNT OF NOT MORE THAN 200% BY WEIGHT OF THE WEIGHT OF THE PERLITE TREATED; AND HEATING SAID WETTED PERLITE TO A TEMPERATURE SUFFICIENTLY HIGH TO DRIVE OFF SAID SOLVENT WITHOUT PRODUCING CALCINATION OR FUSING OF SAID PERLITE.
Claim 2
Independent Claim
126 words
A METHOD FOR TREATING A PERLITE FILTER-AID HAVING A LOW FLOWRATE TO INCREASE THE FLOWRATE OF SAID FILTER-AID WHICH METHOD INCLUDES THE STEPS OF: PRODUCING A COMMINUTED EXPANDED PERLITE FILTER-AID WETTED WITH AN AQUEOUS SOLUTION CONTAINING AN AQUEOUS SOLVENT AND AT LEAST ONE AGENT OF THE GROUP CONSISTING OF THE OXY ACIDS OF PHOSPHOROUS, AND THEIR SOLUBLE INORGANIC SALTS, SAID AGENT BEING PRESENT IN AN AMOUNT TO PROVIDE BETWEEN ABUT .1% AND 10% OF P2O5 BY WEIGHT OF THE PERLITE TREATED, SAID AQUEOUS SOLVENT BEING PRESENT IN AN AMOUNT OF NOT MORE THAN 200% BY WEIGHT OF THE WEIGHT OF THE PERLITE TREATED; AND HEATING SAID WETTED PERLITE TO A TEMPERATURE SUFFICIENTLY HIGH TO DRIVE OFF SAID SOLVENT WITHOUT PRODUCING CALCINATION OR FUSING OF SAID PERLITE.
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) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |