US2500597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric 2, 2, 4-trimethyl-tetrahydroquinoline
Assignee: Dow Chemical Co
•
Filing: 1948-02-02
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Granted: 1950-03-14
•
Expires: 1968-02-02
Abstract
No abstract record available.
Inventors
- 👤 James B Arnold
- 👤 Lester J Dankert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:52
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08L; C08L21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD OF MAKING POLYMERIC 2,2,4-TRIMETHYL-TETRAHYDROQUINOLINE WHICH COMPRISES REACTING HYDROGEN, AT A PRESSURE OF FROM 300 TO 500 POUNDS PER SQUARE INCH AND AT TEMPERATURES BETWEEN ABOUT 100* AND ABOUT 200*C. IN THE PRESENCE OF FINELY DIVIDED PALLADIUM, WITH POLYMERIC 2,2,4TRIMETHYL-DIHYDROQUINOLINE, THE LATTER BEING A PRODUCT OBTAINED BY HEATING 2,2,4-TRIMETHYL-DIHYDROQUINOLINE WITH A STRONG NON-OXIDIZING MINERAL ACID.
Claim 2
Independent Claim
56 words
A METHOD OF MAKING POLYMERIC 2,2,4-TRIMETHYL-TETRAHYDROQUINOLINE WHICH COMPRISES REACTING HYDROGEN, AT A PRESSURE OF FROM 300 TO 500 POUNDS PER SQUARE INCH AND AT TEMPERATURES BETWEEN ABOUT 100* AND ABOUT 200*C. IN THE PRESENCE OF FINELY DIVIDED PALLADIUM, WITH POLYMERIC 2,2,4TRIMETHYL-DIHYDROQUINOLINE, THE LATTER BEING A PRODUCT OBTAINED BY HEATING 2,2,4-TRIMETHYL-DIHYDROQUINOLINE WITH A STRONG NON-OXIDIZING MINERAL ACID.
References Cited (Backward Citations)
US2064752A
Cited
US2063158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |