US2706189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid polymers of propylene oxide
Assignee: Dow Chemical Co
•
Filing: 1952-06-05
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Granted: 1955-04-12
•
Expires: 1972-06-05
Abstract
No abstract record available.
Inventors
- 👤 Malcolm E Pruitt
- 👤 Joseph M Baggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:28
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2645; C08G65/266
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A SOLID HOMOPOLYMER OF PROPYLENE OXIDE HAVING A MELTING POINT ABOVE 70* C. AND AN AVERAGE MOLECULAR WEIGTH ABOVE 100,000 STABILIZED AGAINST DECOMPOSITION BY HAVING INCORPORATED THEREIN APPROXIMATELY 0:5 TO 2 PER CENT BY WEIGHT OF AN ANTIOXIDANT OF THE CLASS CONSISTING OF PHENOLS AND AROMATIC AMINES.
Claim 2
Dependent Claim
14 words
A COMPOSITION ACCORDING TO CLAIM 8 WHEREIN THE ANTIOXIDANT IS 2,2''-METHYLENE BIS(4-METHYL-6-TERTIARY BUTYL PHENOL).
References Cited (Backward Citations)
US2641614A
Cited
GB610505A
Cited
GB601604A
Cited
US2481278A
Cited
US2484370A
Cited
US2556048A
Cited
US2516960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-11 | 1958-10-11 | 1959-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-11 | 1962-10-11 | 1963-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-11 | 1966-10-11 | 1967-04-12 | $7700.00 | Window Closed / Lapsed |