US2946755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of diatomaceous earth
Assignee: Individual
•
Filing: 1956-10-03
•
Granted: 1960-07-26
•
Expires: 1976-10-03
Abstract
No abstract record available.
Inventors
- 👤 Charles A Frankenhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:26
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/14; C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3009; C09C1/3027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR THE RECOVERY OF DIATOMACEOUS EARTH IN CONDITION FOR USE AS A FILTER AID FROM AN INTIMATE MIXTURE OF THE DIATOMACEOUS EARTH AND HEAT-CARBONIZABLE ORGANIC MATTER INCLUDING A CARBOHYDRATE DISPOSED BETWEEN THE PARTICLES OF DIATOMACEOUS EARTH AND IN THE PROPORTION OF AT LEAST 20% OF THE WEIGHT OF THE DIATOMACEOUS EARTH ON THE DRY BASIS, WHICH COMPRISES HEATING THE DIATOMACEOUS EARTH AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 700* TO ABOUT 1100*F. WHILE LIMITING AVAILABLE AIR, THEREBY EFFECTING CARBONIZATION OF THE ORGANIC MATERIAL WITHOUT BURNING, THEN HEATING THE DIATOMACEOUS EARTH AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 1200* TO ABOUT 1800*F. BELOW THE SINTERING TEMPERATURE OF MINERALS CONTAINED THEREIN IN THE PRESENCE OF SUFFICIENT AIR TO EFFECT SUBSTANTIALLY COMPLETE OXIDATION OF CARBONIZED MATTER, AND ONLY THEN BREAKING UP ANY LUMPS PRESENT.
Claim 2
Dependent Claim
135 words
A PROCESS FOR THE RECOVERY OF DIATOMACEOUS EARTH IN CONDITION FOR USE AS A FILTER AID FROM AN INTIMATE MIXTURE OF THE DIATOMACEOUS EARTH AND HEAT-CARBONIZABLE ORGANIC MATTER INCLUDING A CARBOHYDRATE DISPOSED BETWEEN THE PARTICLES OF DIATOMACEOUS EARTH AND IN THE PROPORTION OF AT LEAST 20% OF THE WEIGHT OF THE DIATOMACEOUS EARTH ON THE DRY BASIS, WHICH COMPRISES HEATING THE DIATOMACEOUS EARTH AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 700* TO ABOUT 1100*F. WHILE LIMITING AVAILABLE AIR, THEREBY EFFECTING CARBONIZATION OF THE ORGANIC MATERIAL WITHOUT BURNING, THEN HEATING THE DIATOMACEOUS EARTH AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 1200* TO ABOUT 1800*F. BELOW THE SINTERING TEMPERATURE OF MINERALS CONTAINED THEREIN IN THE PRESENCE OF SUFFICIENT AIR TO EFFECT SUBSTANTIALLY COMPLETE OXIDATION OF CARBONIZED MATTER, AND ONLY THEN BREAKING UP ANY LUMPS PRESENT.
References Cited (Backward Citations)
US1475502A
Cited
US1782648A
Cited
US2357332A
Cited
US2299258A
Cited
US2461838A
Cited
US2416214A
Cited
US2616858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |