US2665813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High flow rate mineral filter aid
Assignee: GREAT LAKES CARBON Corp
•
Filing: 1949-05-09
•
Granted: 1954-01-12
•
Expires: 1969-05-09
Abstract
No abstract record available.
Inventors
- 👤 Armand R Bollaert
- 👤 Ernest L Neu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:30
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A FILTER AID COMPOSED OF BROKEN AND UNBROKEN PARTICLES OF VESICULATED PERLITIC MINERAL OF WHICH NOT LESS THAN 10 PER CENT NOR MORE THAN 35 PER CENT BY WEIGHT ARE UNBROKEN PARTICLES AND RETAINED ON A #50 U. S. SERIES SCREEN AND NOT LESS THAN 10 PER CENT NOR MORE THAN 25 PER CENT ARE BROKEN PARTICLES WHICH WILL PASS A #325 U. S. SERIES SCREEN, THE INTERMEDIATE FRACTION OF SAID FILTER AID CONSISTING OF PARTICLES OF SUBSTANTIALLY EVENTLY GRANDUATED SIZES.
Claim 2
Dependent Claim
81 words
A FILTER AID COMPOSED OF BROKEN AND UNBROKEN PARTICLES OF VESICULATED PERLITIC MINERAL OF WHICH NOT LESS THAN 10 PER CENT NOR MORE THAN 35 PER CENT BY WEIGHT ARE UNBROKEN PARTICLES AND RETAINED ON A #50 U. S. SERIES SCREEN AND NOT LESS THAN 10 PER CENT NOR MORE THAN 25 PER CENT ARE BROKEN PARTICLES WHICH WILL PASS A #325 U. S. SERIES SCREEN, THE INTERMEDIATE FRACTION OF SAID FILTER AID CONSISTING OF PARTICLES OF SUBSTANTIALLY EVENTLY GRANDUATED SIZES.
References Cited (Backward Citations)
USRE19166E
Cited
US2501698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |