Patent US2560642A successfully refreshed from Google Patents.
US2560642A
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US
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Treatment of pitches or tars and the manufacture of molded articles therefrom
Assignee: CD Patents Ltd
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Filing: 1947-09-16
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Granted: 1951-07-17
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Expires: 1967-09-16
Abstract
No abstract record available.
Inventors
- 👤 Greaves Charles Desmond
- 👤 Smith Derek Bryce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:24
CPC Classifications
C; C10; C10L; C10L5/00; C10L5/02; C10L5/04; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR PRODUCING MOULDED PRODUCTS FROM PITCH WHICH COMPRISES THE STEPS OF PREPARING A SOLUTION OF PITCH COMPRISING ONE PART OF PITCH IN THREE PARTS OF NAPHTHA BY WEIGHT, ADMIXING THEREWITH 2 1/2 PARTS OF CARBON BLACK TO 30 PARTS BY WEIGHT OF SAID SOLUTION, POLYMERIZING THE SOLUBILIZED PITCH BY AGITATING THE ADMIXTURE AND ADDING THERETO AT A TEMPERATURE ABOVE 100* C. ONE PART BY WEIGHT OF CONCENTRATED SULPHURIC ACID, RECOVERING THE POLYMERIZED PITCH PRECIPITATE BY THE LAST NAMED ADDITION, WASHING AND DRYING THE PRECIPITATE SO RECOVERED, MOULDING THE WASHED AND DRIED PRECIPITATE TO THE REQUIRED SHAPE, AND SUBJECTING THE MOULDED SHAPE TO HEAT TREATMENT.
Claim 2
Dependent Claim
106 words
A PROCESS FOR PRODUCING MOULDED PRODUCTS FROM PITCH WHICH COMPRISES THE STEPS OF PREPARING A SOLUTION OF PITCH COMPRISING ONE PART OF PITCH IN THREE PARTS OF NAPHTHA BY WEIGHT, ADMIXING THEREWITH 2 1/2 PARTS OF CARBON BLACK TO 30 PARTS BY WEIGHT OF SAID SOLUTION, POLYMERIZING THE SOLUBILIZED PITCH BY AGITATING THE ADMIXTURE AND ADDING THERETO AT A TEMPERATURE ABOVE 100* C. ONE PART BY WEIGHT OF CONCENTRATED SULPHURIC ACID, RECOVERING THE POLYMERIZED PITCH PRECIPITATE BY THE LAST NAMED ADDITION, WASHING AND DRYING THE PRECIPITATE SO RECOVERED, MOULDING THE WASHED AND DRIED PRECIPITATE TO THE REQUIRED SHAPE, AND SUBJECTING THE MOULDED SHAPE TO HEAT TREATMENT.
References Cited (Backward Citations)
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US1288723A
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US1868211A
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US2002004A
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US2299469A
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US2177856A
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US2281728A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |