US2508474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of activated carbon
Assignee: Union Carbide Corp
•
Filing: 1945-09-19
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Granted: 1950-05-23
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Expires: 1965-09-19
Abstract
No abstract record available.
Inventors
- 👤 John A Slyh
- 👤 Janes Milton
- 👤 Ernest G Doying
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:40
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/342; C01B32/348
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
PROCESS OF MAKING ACTIVATED CARBON OF CHARACTERISTICS VALUABLE AS GAS MASK ADSORBENT, WHICH COMPRISES IMPREGNATING LOW DENSITY CELLULOSIC MATERIAL WITH CONCENTRATED AQUEOUS ZINC CHLORIDE, CONTINUOUSLY AGITATING THE IMPREGNATED MIXTURE WHILE HEATING TO A TEMPERATURE OF ABOUT 120*C. TO 145*C. AT A HEATING RATE TO PROVIDE SAID MAXIMUM TEMPERATURE IN A PERIOD NOT LESS THAN ABOUT FIFTY MINUTES, TERMINATING SAID HEATING WHEN THE MIX TEMPERATURE BEGINS TO DECREASE WITHOUT CHANGE IN EXTERNAL HEAT INPUT, COMPACTING THE REACTED MASS INTO FORMS OF APPRECIABLE SIZE, HEATING SAID FORMS AT A TEMPERATURE PRODUCING A DRY AND BRITTLE CONDITION, CRUSHING THE DRIED FORMS INTO GRANULAR PARTICLES, AND SUBSEQUENTLY CALCINING THE GRANULAR PRODUCT AT A TEMPERATURE NOT LESS THAN ABOUT 1000*C. FOR A PERIOD OF AT LEAST THIRTY MINUTES.
Claim 2
Dependent Claim
123 words
PROCESS OF MAKING ACTIVATED CARBON OF CHARACTERISTICS VALUABLE AS GAS MASK ADSORBENT, WHICH COMPRISES IMPREGNATING LOW DENSITY CELLULOSIC MATERIAL WITH CONCENTRATED AQUEOUS ZINC CHLORIDE, CONTINUOUSLY AGITATING THE IMPREGNATED MIXTURE WHILE HEATING TO A TEMPERATURE OF ABOUT 120*C. TO 145*C. AT A HEATING RATE TO PROVIDE SAID MAXIMUM TEMPERATURE IN A PERIOD NOT LESS THAN ABOUT FIFTY MINUTES, TERMINATING SAID HEATING WHEN THE MIX TEMPERATURE BEGINS TO DECREASE WITHOUT CHANGE IN EXTERNAL HEAT INPUT, COMPACTING THE REACTED MASS INTO FORMS OF APPRECIABLE SIZE, HEATING SAID FORMS AT A TEMPERATURE PRODUCING A DRY AND BRITTLE CONDITION, CRUSHING THE DRIED FORMS INTO GRANULAR PARTICLES, AND SUBSEQUENTLY CALCINING THE GRANULAR PRODUCT AT A TEMPERATURE NOT LESS THAN ABOUT 1000*C. FOR A PERIOD OF AT LEAST THIRTY MINUTES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |