US3568405A
Expired / Lapsed
US
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Filtration method and apparatus
Assignee: Portable Treaters Inc
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Filing: 1969-05-07
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Granted: 1971-03-09
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Expires: 1989-05-07
Abstract
Abstract CONTAMINATED SOLUTIONS, SUCH AS AQUEOUS AMINE TREATING SOLUTION USED IN THE DESULFURIZATION OF NATURAL GAS, ARE PURIFIED BY PASSING THE CONTAMINATED STREAMS THROUGH A FILTER BED OF CHARCOAL PARTICLES HAVING SIZE GENERALLY WITHIN THE RANGE OF NO.2 TO NO. 12 MESH SCREEN (TYLER), AND AT A RATE OF NO GREATER THAM 4 GALLON PER MINUTE PER CUBIC FOOT OF FILTER BED. PREFERABLY, THE CONTAMINATED STREAM IS PASSED TO THE BED AT A VELOCITY (RELATIVE TO THE CROSS SECTIONAL AREA OF SAID BED NORMAL TO FLOW) OF NO GREATER THAN 15 GALLON PR MINUTE PER SQUARE FOOT OF FILTER BED.
Inventors
- 👤 Charles R Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:45
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/283; B; B01; B01D; B01D15/00; C07; C07C; C07C7/00; C07C7/11; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/12; C02F2103/00; C02F2103/18
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |