US3618330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solidified gas filter
Assignee: Cardox Corp
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Filing: 1968-09-12
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Granted: 1971-11-09
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Expires: 1988-09-12
Abstract
Abstract AN APPARATUS AND METHOD OF FILTERING SOLID GAS PARTICLES FROM A GAS STREAM WHEREIN A LIQUEFIED GAS SUCH AS LIQUID CARBON DIOXIDE IS FLASHED INTO A CLOSED CHAMBER TO FORM GAS AND A PARTICULATE SNOW-LIKE MATERIAL AND SOME OF THE SOLID MATERIAL IS SUBSEQUENTLY EMPLOYES AS A POROUS FILTER FOR THE GAS TO SEPARATE THE SOLID MATTER. THE AMOUNT OF SAID MATERIAL EMPLOYED AS A FILTER IS REGULATED TO PROVIDE A CONSTANT PRESSURE DROP FOR THE GAS ACROSS THE FILTER. THE PARTICULATE SOLIDIFIED GAS MATERIAL AFTER BEING FILTERED IS SUBSEQUENTLY COMPRESSED INTO PELLETS.
Inventors
- 👤 Robert C Hardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:49
CPC Classifications
B; B01; B01D; B01D46/00; C; C01; C01B; C01B32/00; C01B32/50; C01B32/55
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |