Patent US3042724A successfully refreshed from Google Patents.
US3042724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of naphthalenethiol
Assignee: Wyeth Holdings LLC
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Filing: 1959-09-22
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Granted: 1962-07-03
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Expires: 1979-09-22
Abstract
No abstract record available.
Inventors
- 👤 David S Hoffenberg
- 👤 Robert G Haldeman
- 👤 William B Hardy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:05
CPC Classifications
C; C07; C07C; C07C323/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR THE PREPARATION OF NAPHTHALENETHIOL WHICH COMPRISES REACTING A NAPHTHOL WITH HYDROGEN SULFIDE IN THE PRESENCE OF A THORIA DEHYDRATION CATALYST AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF FROM ABOUT 350*C. TO ABOUT 600*C.
Claim 2
Dependent Claim
38 words
A PROCESS FOR THE PREPARATION OF NAPHTHALENETHIOL WHICH COMPRISES REACTING A NAPHTHOL WITH HYDROGEN SULFIDE IN THE PRESENCE OF A THORIA DEHYDRATION CATALYST AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF FROM ABOUT 350*C. TO ABOUT 600*C.
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) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |