Patent US2796331A successfully refreshed from Google Patents.
US2796331A
Expired / Lapsed
US
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Process for making fibrous carbon
Assignee: Pittsburgh Coke and Chemical Co
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Filing: 1954-06-09
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Granted: 1957-06-18
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Expires: 1974-06-09
Abstract
No abstract record available.
Inventors
- 👤 Harry F Kauffman
- 👤 David J Griffiths
- 👤 Johnstone S Mackay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:15
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/127; D01F9/1271; B; B82; B82Y; B82Y30/00; D01F9/1272; D01F9/1273; D01F9/1275; D01F9/1276; D01F9/1278; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR MAKING FIBROUS CARBON COMPRISING THE STEPS OF PASSING THROUGH A PYROLYSIS ZONE A GAS COMPRISING 20 TO 80% METHANE, THE BALANCE OF THE GAS PRIMARILY BEING HYDROGEN, AT A TEMPERATURE BETWEEN 1150* AND 1450* C., USING A RESIDENCE TIME OF BETWEEN 0.4 SECOND AND 15 SECONDS AND COLLECTING THE FIBROUS CARBON.
Claim 2
Dependent Claim
54 words
A PROCESS FOR MAKING FIBROUS CARBON COMPRISING THE STEPS OF PASSING THROUGH A PYROLYSIS ZONE A GAS COMPRISING 20 TO 80% METHANE, THE BALANCE OF THE GAS PRIMARILY BEING HYDROGEN, AT A TEMPERATURE BETWEEN 1150* AND 1450* C., USING A RESIDENCE TIME OF BETWEEN 0.4 SECOND AND 15 SECONDS AND COLLECTING THE FIBROUS CARBON.
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) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |