US2866815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the
Assignee: —
•
Filing: —
•
Granted: 1958-12-30
•
Expires: 1975-12-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:01
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/15; C07C51/16; C07C51/21; C07C51/255; C07C51/265; C07C63/00; C07C63/04; C07C63/14; C07C63/15; C07C63/26; C07C63/307
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR THE PRODUCTION OF AROMATIC MONOAND DICARBOXYLIC ACIDS WHICH COMPRISES THE STEPS OF HEATING SALTS OF ORGANIC ACIDS WHEREIN A PHOSPHORUS ATOM IS DIRECTLY ATTACHD TO AN AROMATIC RING SYSTEM SELECTED FROM THE GROUP CONSISTING OF AROMATIC PHOSPHONIC AND PHOSPHONOUS ACIDS, IN A SUBSTANTIALLY OXYGEN FREE, SUBSTANTIALLY ANHYDROUS ATMOSHPERE OF CARBON DIOXIDE, IN THE PRESENCE OF AN ALKALI METAL CARBONATE, TO A TEMPERATURE OF AT LEAST 200*C. BUT NOT HIGHER THAN THE TEMPERATURE AT WHICH THE STARTING MATERIALS AND PRODUCTS WILL SUBSTANTIALLY DECOMPOSE, AND THEREAFTER SEPARATING THE AROMATIC ACID PRODUCTS.
Claim 2
Dependent Claim
92 words
A PROCESS FOR THE PRODUCTION OF AROMATIC MONOAND DICARBOXYLIC ACIDS WHICH COMPRISES THE STEPS OF HEATING SALTS OF ORGANIC ACIDS WHEREIN A PHOSPHORUS ATOM IS DIRECTLY ATTACHD TO AN AROMATIC RING SYSTEM SELECTED FROM THE GROUP CONSISTING OF AROMATIC PHOSPHONIC AND PHOSPHONOUS ACIDS, IN A SUBSTANTIALLY OXYGEN FREE, SUBSTANTIALLY ANHYDROUS ATMOSHPERE OF CARBON DIOXIDE, IN THE PRESENCE OF AN ALKALI METAL CARBONATE, TO A TEMPERATURE OF AT LEAST 200*C. BUT NOT HIGHER THAN THE TEMPERATURE AT WHICH THE STARTING MATERIALS AND PRODUCTS WILL SUBSTANTIALLY DECOMPOSE, AND THEREAFTER SEPARATING THE AROMATIC ACID PRODUCTS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |