US2597159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation of aromatic hydrocarbons with formaldehyde catalyzed by formic acid
Assignee: Pan American Refining Corp
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Filing: 1950-04-27
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Granted: 1952-05-20
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Expires: 1970-04-27
Abstract
No abstract record available.
Inventors
- 👤 Paul D May
- 👤 Robert J Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:55
CPC Classifications
C; C08; C08G; C08G10/00; C08G10/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS WHICH COMPRISES CONTACTING AN AROMATIC HYDROCARBON HAVING AT LEAST ONE UNSUBSTITUTED NUCLEAR CARBON ATOM AND FORMALDEHYDE WITH A CATALYST CONSISTING ESSENTIALLY OF FORMIC ACID AT A TEMPERATURE BETWEEN ABOUT 10* C. AND ABOUT 130* C. AND SEPARATING AN ORGANIC CHEMICAL CONDENSATION PRODUCT THUS PRODUCED.
Claim 2
Dependent Claim
46 words
A PROCESS WHICH COMPRISES CONTACTING AN AROMATIC HYDROCARBON HAVING AT LEAST ONE UNSUBSTITUTED NUCLEAR CARBON ATOM AND FORMALDEHYDE WITH A CATALYST CONSISTING ESSENTIALLY OF FORMIC ACID AT A TEMPERATURE BETWEEN ABOUT 10* C. AND ABOUT 130* C. AND SEPARATING AN ORGANIC CHEMICAL CONDENSATION PRODUCT THUS PRODUCED.
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) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |