Patent US2570022A successfully refreshed from Google Patents.
US2570022A
Expired / Lapsed
US
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Production of chlorinated methyl naphthalenes
Assignee: PETROCARBON Ltd
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Filing: 1948-02-24
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Granted: 1951-10-02
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Expires: 1968-02-24
Abstract
No abstract record available.
Inventors
- 👤 Boyd-Barrett Herber Stanislaus
- 👤 Holker James Ronald
- 👤 Steiner Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:28
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/10; C07C17/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PROCESS FOR THE PRODUCTION OF SIDE-CHAIN CHLORINATED MONO-METHYL NAPHTHALENES BY THE VAPOR PHASE CHLORINATION OF METHYL NAPHTHALENE, WHICH COMPRISES CONTINUOUSLY PREHEATING CHLORINE AND VAPORIZED METHYL NAPHTHALENE SEPARATELY AND TO A TEMPERATURE BETWEEN THE VAPORIZATION POINT OF METHYL NAPHTHALENE AT THE PRESSURE EMPLOYED AND 500* C., CONTINUOUSLY BRINGING THE TWO VAPORS INTO CONTACT WITH EACH OTHER AT THE ABOVE TEMPERATURE UNDER A PRESSURE OF BETWEEN 1 TO 2 ATMOSPHERES ABSOLUTE FOR A PERIOD NOT TO EXCEED 5 SECONDS, AND CONTINUOUSLY REGULATING THE RELATIVE AMOUNTS OF THE TWO GASES SO THAT THE AMOUNT OF CHLORINE VAPOR IN CONTACT WITH THE METHYL NAPHTHALENE VAPOR IS ALWAYS LESS THAN THE STOICHIOMETRIC AMOUNT REQUIRED FOR COMPLETE MONO-SUBSTITUTION BY CHLORINE OF ALL THE METHYL NAPHTHALENE PRESENT, AND CONTINUOUSLY SEPARATING THE FORMED CHLOROMETHYL NAPHTHALENES FROM THE UNREACTED METHYL NAPHTHALENE BY FRACTIONAL DISTILLATION.
Claim 2
Dependent Claim
136 words
A PROCESS FOR THE PRODUCTION OF SIDE-CHAIN CHLORINATED MONO-METHYL NAPHTHALENES BY THE VAPOR PHASE CHLORINATION OF METHYL NAPHTHALENE, WHICH COMPRISES CONTINUOUSLY PREHEATING CHLORINE AND VAPORIZED METHYL NAPHTHALENE SEPARATELY AND TO A TEMPERATURE BETWEEN THE VAPORIZATION POINT OF METHYL NAPHTHALENE AT THE PRESSURE EMPLOYED AND 500* C., CONTINUOUSLY BRINGING THE TWO VAPORS INTO CONTACT WITH EACH OTHER AT THE ABOVE TEMPERATURE UNDER A PRESSURE OF BETWEEN 1 TO 2 ATMOSPHERES ABSOLUTE FOR A PERIOD NOT TO EXCEED 5 SECONDS, AND CONTINUOUSLY REGULATING THE RELATIVE AMOUNTS OF THE TWO GASES SO THAT THE AMOUNT OF CHLORINE VAPOR IN CONTACT WITH THE METHYL NAPHTHALENE VAPOR IS ALWAYS LESS THAN THE STOICHIOMETRIC AMOUNT REQUIRED FOR COMPLETE MONO-SUBSTITUTION BY CHLORINE OF ALL THE METHYL NAPHTHALENE PRESENT, AND CONTINUOUSLY SEPARATING THE FORMED CHLOROMETHYL NAPHTHALENES FROM THE UNREACTED METHYL NAPHTHALENE BY FRACTIONAL DISTILLATION.
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) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |