US3862962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing granular active carbon from a mixture of asphalt and elementary sulfur
Assignee: IDEMITSO KOSAN KK
•
Filing: 1973-04-24
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Granted: 1975-01-28
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Expires: 1993-04-24
Abstract
Abstract A process for producing from a mixture of asphalt and elementary sulfur granular active carbon possessing high mechanical strength, which comprises reacting said mixture under heating to form an infusible hardened product, pulverizing such product into powder, shaping the powder with asphalt as binder into granular form, baking the resulting granules in a stream of an oxygencontaining gas having an oxygen content of at most 20 percent and then activating the granules in a usual manner.
Inventors
- 👤 Tomoaki Hanamura
- 👤 Ryuzo Ijiri
- 👤 Masami Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:58
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/384; C01B32/312; C01B32/318; C01B32/33
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
17 words
A process according to claim 1 wherein said baking temperature is within the range of about 260*-400*C.
Claim 2
Dependent Claim
18 words
A process according to claim 1 wherein said oxygen-containing gas has an oxygen content of about 4-10 percent.
Claim 3
Dependent Claim
8 words
Products obtained by the process of claim 1.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |