US2534255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxy polyesters
Assignee: Individual
•
Filing: 1947-08-22
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Granted: 1950-12-19
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Expires: 1967-08-22
Abstract
No abstract record available.
Inventors
- 👤 Edward M Filachione
- 👤 Martin L Fein
- 👤 Charles H Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:14
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/66; C07C69/67; C07C69/675; C07C69/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS COMPRISING HEATING AN ALIPHATIC HYDROXY CARBOXYLIC ACID ESTER OF THE GENERAL FORMULA HO--CH(R)COOR'' WHEREIN R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND A LOWER ALKYL GROUP AND R'' REPRESENTS A LOWER ALKYL GROUP, IN THE PRESENCE OF AN ESTERFICATION CATALYST AND WITH SIMULTANEOUS AND CONTINUOUS REMOVAL OF THE ALCOHOL FORMED, THEREBY TO PRODUCE A HYDROXY POLYESTER OF THE GENERAL FORMULA HO--(CH(R)COO)NCH(R)COOR'' WHEREIN R AND R'' HAVE THE SAME SIGNIFICANCE AS ABOVE AND N REPRESENTS A SMALL INTEGER LARGER THAN 1, SAID HYDROXY POLYESTER HAVING A SAPONIFICATION EQUIVALENT NOT SUBSTANTIALLY LESS THAN 78.6.
Claim 2
Dependent Claim
98 words
A PROCESS COMPRISING HEATING AN ALIPHATIC HYDROXY CARBOXYLIC ACID ESTER OF THE GENERAL FORMULA HO--CH(R)COOR'' WHEREIN R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND A LOWER ALKYL GROUP AND R'' REPRESENTS A LOWER ALKYL GROUP, IN THE PRESENCE OF AN ESTERFICATION CATALYST AND WITH SIMULTANEOUS AND CONTINUOUS REMOVAL OF THE ALCOHOL FORMED, THEREBY TO PRODUCE A HYDROXY POLYESTER OF THE GENERAL FORMULA HO--(CH(R)COO)NCH(R)COOR'' WHEREIN R AND R'' HAVE THE SAME SIGNIFICANCE AS ABOVE AND N REPRESENTS A SMALL INTEGER LARGER THAN 1, SAID HYDROXY POLYESTER HAVING A SAPONIFICATION EQUIVALENT NOT SUBSTANTIALLY LESS THAN 78.6.
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) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |