US3272775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aromatic polyethers from a bisphenol
Assignee: Sunoco Inc
•
Filing: 1964-07-16
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Granted: 1966-09-13
•
Expires: 1984-07-16
Abstract
No abstract record available.
Inventors
- 👤 Edward J Mcnelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:40
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
METHOD FOR PREPARING AROMATIC POLYETHERS WHICH COMPRISES CONTACTING A MATERIAL HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
14 words
METHOD FOR PREPARING AROMATIC POLYETHERS WHICH COMPRISES CONTACTING A MATERIAL HAVING THE GENERAL FORMULA
Claim 3
Dependent Claim
53 words
METHOD FOR PREPARING AROMATIC POLYETHERS WHICH COMPRISES CONTACTING 2,2''-BIS-(4-HYDROXY-3,5-DIMETHYL PHENYL)PROPANE WITH FROM 0.01 TO 100.0 MOLES OF LEAD DIOXIDE PER MOLE OF 2,2''-BIS-(4-HYDROXY-3,5DIMETHYL PHENYL)PROPANE AT A TEMPERATURE IN THE RANGE OF FROM 20* TO 250*C. FOR A PERIOD OF TIME RANGING BETWEEN 10 SECONDS AND 10 HOURS AND THEREAFTER RECOVERING SAID AROMATIC POLYETHER.
Claim 4
Dependent Claim
53 words
METHOD FOR PREPARING AROMATIC POLYETHERS WHICH COMPRISES CONTACTING 2,2''-BIS-(4-HYDROXY-3,5-DIMETHYL PHENYL)PROPANE WITH FROM 0.01 TO 100.0 MOLES OF LEAD DIOXIDE PER MOLE OF 2,2''-BIS-(4-HYDROXY-3,5DIMETHYL PHENYL)PROPANE AT A TEMPERATURE IN THE RANGE OF FROM 20* TO 250*C. FOR A PERIOD OF TIME RANGING BETWEEN 10 SECONDS AND 10 HOURS AND THEREAFTER RECOVERING SAID AROMATIC POLYETHER.
References Cited (Backward Citations)
US3220979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |