US2742494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed esters of phthalic acids and process for production thereof
Assignee: Hercules Powder Co
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Filing: 1952-09-26
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Granted: 1956-04-17
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Expires: 1972-09-26
Abstract
No abstract record available.
Inventors
- 👤 Richard G Mraz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:49
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A MONOMERIC MIXED ESTER OF A PHTHALIC ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID WHEREIN ONE OF THE CARBOXYL GROUPS IS ESTERIFIED WITH AN ALKANOL OF FROM 1 TO 4 CARBON ATOMS AND WHEREIN THE OTHER CARBOXYL GROUP IS ESTERIFIED WITH GLYCOL OF THE SERIES HO(CH2)NOH WHERE N IS AN INTEGER OF FROM 2 TO 10.
Claim 2
Dependent Claim
61 words
A MONOMERIC MIXED ESTER OF A PHTHALIC ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID WHEREIN ONE OF THE CARBOXYL GROUPS IS ESTERIFIED WITH AN ALKANOL OF FROM 1 TO 4 CARBON ATOMS AND WHEREIN THE OTHER CARBOXYL GROUP IS ESTERIFIED WITH GLYCOL OF THE SERIES HO(CH2)NOH WHERE N IS AN INTEGER OF FROM 2 TO 10.
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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |