Patent US3787540A successfully refreshed from Google Patents.
US3787540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzylation of dialkyl phosphites with dithiourethanes
Assignee: Novartis Corp
•
Filing: 1972-05-05
•
Granted: 1974-01-22
•
Expires: 1992-05-05
Abstract
Abstract ESTERS OF P-HYDROXYBEZYLPHOSPHONIC ACIDS ARE PREPARED BY REACTING A P-HYDROXYBENZYLDITHIOURETHANS WITH ESTERS OF PHOSPHONIC ACIDS IN THE THE PRESENCE OF A BASE. THE ESTERS OF P-HYDROXYBENZYLPHOSPHONIC ACIDS ARE STABILIZERS FOR POLYMERS.
Inventors
- 👤 H Brunetti
- 👤 A Schmidt
- 👤 K Schwarzenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:49
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4056; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C09; C09K; C09K15/00; C09K15/04; C09K15/32; C09K15/322; C09K15/324
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |