US2648440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cleaning filter sand beds
Assignee: Wittichen Chemical Co
•
Filing: 1949-10-28
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Granted: 1953-08-11
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Expires: 1969-10-28
Abstract
No abstract record available.
Inventors
- 👤 William O Mullins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:34
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/20; B01D24/22; B01D24/46; B01D24/4631; B01D24/4642; B01D24/4668; B01D24/4673
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD OF CLEANING A FILTER SAND BED COMPRISING THE STEPS OF COVERING SAID BED WITH WATER, DISSOLVING IN SAID WATER FROM 1 TO 5.7 POUNDS OF SODIUM BISULFITE PER SQUARE FOOT OF SAND SURFACE AREA THUS FORMING AN AQUEOUS SOLUTION OF SODIUM BISULFITE, ADDING SULFURIC ACID TO SAID SOLUTION IN AN AMOUNT EQUIVALENT TO FORM 2.8 TO 9.8 POUNDS AT 66* BE. PER SQUARE FOOT OF SAND SURFACE AREA THUS BRINGING ABOUT A CHEMICAL REACTION, AND DRAWING THE SOLUTION THUS FORMED
Claim 2
Independent Claim
82 words
THE METHOD OF CLEANING A FILTER SAND BED COMPRISING THE STEPS OF COVERING SAID BED WITH WATER, DISSOLVING IN SAID WATER FROM 1 TO 5.7 POUNDS OF SODIUM BISULFITE PER SQUARE FOOT OF SAND SURFACE AREA THUS FORMING AN AQUEOUS SOLUTION OF SODIUM BISULFITE, ADDING SULFURIC ACID TO SAID SOLUTION IN AN AMOUNT EQUIVALENT TO FORM 2.8 TO 9.8 POUNDS AT 66* BE. PER SQUARE FOOT OF SAND SURFACE AREA THUS BRINGING ABOUT A CHEMICAL REACTION, AND DRAWING THE SOLUTION THUS FORMED
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |