US3346418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying particulate solid materials
Assignee: Glaxo Laboratories Ltd
•
Filing: 1963-11-15
•
Granted: 1967-10-10
•
Expires: 1983-11-15
Abstract
No abstract record available.
Inventors
- 👤 Chapman John Harold
- 👤 Emm Maurice Victor Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:43
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/04; C04B33/06; B; B01; B01D; B01D29/00; B01D29/11; B01D29/31; B01D29/35; B01D29/356; B01D37/00; B01D37/02; C04B33/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A METHOD OF PURIFYING SOLID PARTICLES SUSPENDED IN LIQUID MEDIUM COMPRISING A SOLVENT FOR THE IMPURITIES, WHICH COMPRISES INITIALLY PASSING THE SUSPENSION OVER A POROUS SURFACE AT A PREDETERMINED RAPID RATE OF FLOW SUCH THAT A PORTION ONLY OF SAID LIQUID MEDIUM PASSING OVER THE POROUS SURFACE PASSES THERETHROUGH, WHEREBY SAID PORTION IS SEPARATED FROM SOLID PARTICLES CARRIED THEREBY AND THE SEPARATED SOLID PARTICLES ARE DEPOSITED AND MAINTAINED ON SAID SURFACE IN THE FORM OF A THIN PERVIOUS LAYER, THE REMAINDER OF SAID LIQUID MEDIUM AND SOLID PARTICLES CARRIED THEREBY PASSING COMPLETELY ACROSS SAID POROUS SURFACE, AND THEN CONTINUING TO PASS THE REMAINDER OF
Claim 2
Independent Claim
104 words
A METHOD OF PURIFYING SOLID PARTICLES SUSPENDED IN LIQUID MEDIUM COMPRISING A SOLVENT FOR THE IMPURITIES, WHICH COMPRISES INITIALLY PASSING THE SUSPENSION OVER A POROUS SURFACE AT A PREDETERMINED RAPID RATE OF FLOW SUCH THAT A PORTION ONLY OF SAID LIQUID MEDIUM PASSING OVER THE POROUS SURFACE PASSES THERETHROUGH, WHEREBY SAID PORTION IS SEPARATED FROM SOLID PARTICLES CARRIED THEREBY AND THE SEPARATED SOLID PARTICLES ARE DEPOSITED AND MAINTAINED ON SAID SURFACE IN THE FORM OF A THIN PERVIOUS LAYER, THE REMAINDER OF SAID LIQUID MEDIUM AND SOLID PARTICLES CARRIED THEREBY PASSING COMPLETELY ACROSS SAID POROUS SURFACE, AND THEN CONTINUING TO PASS THE REMAINDER OF
References Cited (Backward Citations)
US1876439A
Cited
US1754432A
Cited
US2100149A
Cited
US2822091A
Cited
US3138551A
Cited
US3214369A
Cited
US3190450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |