Patent US3572999A successfully refreshed from Google Patents.
US3572999A
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US
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Apparatus for cracking hydrocarbons
Assignee: Mitsubishi Chemical Corp
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Filing: 1968-04-10
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Granted: 1971-03-30
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Expires: 1988-04-10
Abstract
Abstract AN EXTERNAL HEATING TYPE THERMAL CRACKING APPARATUS FOR THERMALLY CRACKING HYDROCARBON COMPRISING THERMAL CRACKING TUBES HAVING FLATTENED OR COMPRESSED ROUND CROSSSECTIONAL CONFIGURATION DISPOSED IN SUCH A MANNER THAT THE MAJOR AXES OF SAID CROSS-SECTIONAL CONFIGURATIONS ARE CONFRONTING THE HEAT SOURCE.
Inventors
- 👤 Takehiko Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:17
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/02; B; B01; B01J; B01J12/00; B01J12/005; B01J19/00; B01J19/24; B01J19/2415; C; C10; C10G; C10G9/00; C10G9/14; C10G9/18; C10G9/20; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00159; F28F2225/00; F28F2225/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |