Patent US3923735A successfully refreshed from Google Patents.
US3923735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stabilizing polyamides
Assignee: BASF SE
•
Filing: 1974-09-11
•
Granted: 1975-12-02
•
Expires: 1994-09-11
Abstract
Abstract IN WHICH -X- is -O- and R1 is carbonylalkyl or carbonylaryl. Suitable compounds for stabilizing polyamides against oxidation and thermal degradation are acid esters of 2,6-di-t-butylphenolbutanol of the general formula
Inventors
- 👤 Karl Schlichting
- 👤 Peter Horn
- 👤 Johannes Schlag
- 👤 Wolfgang Koernig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:12
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/134
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
26 words
A PROCESS FOR STABILIZING POLYAMIDES AGAINST OXIDATION AND THERMAL DEGRADATION WHICH COMPRISES ADDING THERETO 0.01 TO 2% BY WEIGHT, BASED ON THE POLYAMIDE, OF THE COMPOUND
Claim 2
Dependent Claim
26 words
A PROCESS FOR STABILIZING POLYAMIDES AGAINST OXIDATION AND THERMAL DEGRADATION WHICH COMPRISES ADDING THERETO 0.01 TO 2% BY WEIGHT, BASED ON THE POLYAMIDE, OF THE COMPOUND
Claim 3
Dependent Claim
18 words
A process as claimed in claim 1 wherein said amount is in the range of 0.1 to 1%.
References Cited (Backward Citations)
US3285855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |