US2653165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation process
Assignee: California Research LLC
•
Filing: 1950-09-27
•
Granted: 1953-09-22
•
Expires: 1970-09-27
Abstract
No abstract record available.
Inventors
- 👤 Irving E Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:02
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A PPROCESS FOR PRODUCING MONESTERS OF PHTHALIC ACIDS WHICH COMPRISES OXIDIZING TOLUIC ACID ESTERS OF LOW MOLECULAR WEIGHT ALKANOLS TO MONO-ESTERS OF PHTHALIC ACIDS BY CONTACTING THEM WITH A FREE OXYGEN-CONTAINING GAS AT AN ELEVATED TEMPERATURE AND RECOVERING PHTHALIC ACID MONO ESTERS FROM A FREE REACTION PRODUCT.
Claim 2
Dependent Claim
47 words
A PPROCESS FOR PRODUCING MONESTERS OF PHTHALIC ACIDS WHICH COMPRISES OXIDIZING TOLUIC ACID ESTERS OF LOW MOLECULAR WEIGHT ALKANOLS TO MONO-ESTERS OF PHTHALIC ACIDS BY CONTACTING THEM WITH A FREE OXYGEN-CONTAINING GAS AT AN ELEVATED TEMPERATURE AND RECOVERING PHTHALIC ACID MONO ESTERS FROM A FREE REACTION PRODUCT.
References Cited (Backward Citations)
US1702188A
Cited
US1815985A
Cited
US1939217A
Cited
US1899919A
Cited
US2339259A
Cited
US2479066A
Cited
US2479067A
Cited
US2531172A
Cited
US2531173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |