US2831817A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3, 6-diisopropyl catechol antioxidant
Assignee: Ethyl Corp
•
Filing: 1956-08-22
•
Granted: 1958-04-22
•
Expires: 1976-08-22
Abstract
No abstract record available.
Inventors
- 👤 George G Ecke
- 👤 Alfred J Kolka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:01
CPC Classifications
C; C07; C07C; C07C39/00; C07C39/02; C07C39/08; C07C37/00; C07C37/11; C07C37/14; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C10; C10L; C10L1/00; C10L1/10; C10L1/103; C10L1/14; C11; C11B; C11B5/00; C11B5/0021; C11B5/0035; C10L1/18; C10L1/182; C10L1/183; C10L1/30; C10L1/305; C10L1/306; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
2 words
3,6-DIISOPROPYL CATECHOL.
Claim 2
Dependent Claim
2 words
3,6-DIISOPROPYL CATECHOL.
Claim 3
Dependent Claim
31 words
AS A NEW COMPOSITION OF MATTER AN ORGANIC MATERIAL NORMALLY TENDING TO DETERIORATE IN THE PRESENCE OF AIR CONTAINING AS AN ANTIOXIDANT A SMALL AMOUNT OF THE COMPOUND OF CLAIM 1.
References Cited (Backward Citations)
US2181102A
Cited
US2603662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |