US2985577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the treatment of coal tars and coal tar products
Assignee: Rain Carbon Germany GmbH
•
Filing: 1957-10-15
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Granted: 1961-05-23
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Expires: 1977-10-15
Abstract
No abstract record available.
Inventors
- 👤 Geller Julius
- 👤 Schweym Erich
- 👤 Puls Heinz
- 👤 Lang Karl Friedrich
- 👤 Damm Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:35
CPC Classifications
C; C10; C10C; C10C1/00; C10C1/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR THE TREATMENT OF COAL TARS, DISTILLATION PRODUCTS OF COAL TARS, AND MIXTURES OF THESE STARTING MATERIALS, CONSISTING OF PASSING THROUGH A TUBE FURNACE UNDER HEATING AND UNDER A PRESSURE OF 3-10 ATMOSPHERES SAID STARTING MATERIALS TO A DISCHARGE TEMPERATURE IN THE RANGE OF 450*-525*C. DISCHARGING THE MATEIAL SUBSTANTIALLY WITHOUT LOSS OF HEAT AND PRESSURE INTO A THERMALLY INSULATED DECOMPOSITION VESSEL, IN WHICH SAID MATERIAL
Claim 2
Dependent Claim
67 words
A PROCESS FOR THE TREATMENT OF COAL TARS, DISTILLATION PRODUCTS OF COAL TARS, AND MIXTURES OF THESE STARTING MATERIALS, CONSISTING OF PASSING THROUGH A TUBE FURNACE UNDER HEATING AND UNDER A PRESSURE OF 3-10 ATMOSPHERES SAID STARTING MATERIALS TO A DISCHARGE TEMPERATURE IN THE RANGE OF 450*-525*C. DISCHARGING THE MATEIAL SUBSTANTIALLY WITHOUT LOSS OF HEAT AND PRESSURE INTO A THERMALLY INSULATED DECOMPOSITION VESSEL, IN WHICH SAID MATERIAL
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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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |