US3617531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective adsorption of phenols from solution in hydrocarbons
Assignee: Texaco Inc
•
Filing: 1970-07-29
•
Granted: 1971-11-02
•
Expires: 1990-07-29
Abstract
Abstract Extraction of phenolic materials from hydrocarbon solutions by means of polyurethane foam.
Inventors
- 👤 Raymond C Schlicht
- 👤 Frederic C Mccoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:49
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
The process as defined in claim 1 conducted at a temperature in the range of 0* to 200* F.
Claim 2
Dependent Claim
25 words
The process as defined in claim 1 wherein said steps are carried out at a temperature in the range of about 20* to 30* C.
Claim 3
Dependent Claim
24 words
The method as defined in claim 1 wherein the polyurethane foam is in the form of particles in the neighborhood of about 10 mesh.
Claim 4
Dependent Claim
15 words
The method according to claim 1 wherein said polyurethane foam is of the ester type.
Claim 5
Dependent Claim
14 words
The method according to claim 1 wherein the polyurethane foam is of ether type.
Claim 6
Dependent Claim
17 words
The method according to claim 1 wherein the polyurethane foam is of the open-celled or reticulate type.
Claim 7
Dependent Claim
19 words
The method according to claim 1 wherein the polyurethane foam containing adsorbed phenolics is regenerated by contacting with acetone.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |