US2836615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methylene blue removal from acrylic monomers
Assignee: Monsanto Chemicals Ltd
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Filing: 1956-03-21
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Granted: 1958-05-27
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Expires: 1976-03-21
Abstract
No abstract record available.
Inventors
- 👤 Heininger Samuel Allen
- 👤 Edward L Doerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:57
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34; C07C51/00; C07C51/42; C07C51/47; C07C67/00; C07C67/48; C07C67/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
THE METHOD FOR THE REMOVAL OF METHYLENE BLUE INHIBITOR FROM SUBSTANTIALLY ANHYDROUS ACRYLIC MONOMER SELECTED FROM THE CLASS CONSISTING OF ACRYLONITRILE, ACRYLIC ACID, AND ALKYL ESTERS OF ACRYLIC ACID WHEREIN THE ESTER ALKYL RADICAL IS DERIVED FROM AN ALCOHOL CONTAINING FROM ONE TO EIGHTEEN CARBON ATOMS, WHICH COMPRISES CONTACTING THE SAID ACRYLIC MONOMER, CONTAINING A POLYMERIZATIONINHIBITING AMOUNT OF METHYLENE BLUE, WITH AN ACTIVELY ADSORBENT MAGNESIUM SILICATE CLAY, AND ISOLATING THEREFROM THE SAID ACRYLIC MONOMER IN A FORM HAVING A DECREASED CONTENT OF METHYLENE BLUE, SUBSTANTIALLY COLORLESS, AND ADAPTED FOR POLYMERIZATION.
Claim 2
Independent Claim
90 words
THE METHOD FOR THE REMOVAL OF METHYLENE BLUE INHIBITOR FROM SUBSTANTIALLY ANHYDROUS ACRYLIC MONOMER SELECTED FROM THE CLASS CONSISTING OF ACRYLONITRILE, ACRYLIC ACID, AND ALKYL ESTERS OF ACRYLIC ACID WHEREIN THE ESTER ALKYL RADICAL IS DERIVED FROM AN ALCOHOL CONTAINING FROM ONE TO EIGHTEEN CARBON ATOMS, WHICH COMPRISES CONTACTING THE SAID ACRYLIC MONOMER, CONTAINING A POLYMERIZATIONINHIBITING AMOUNT OF METHYLENE BLUE, WITH AN ACTIVELY ADSORBENT MAGNESIUM SILICATE CLAY, AND ISOLATING THEREFROM THE SAID ACRYLIC MONOMER IN A FORM HAVING A DECREASED CONTENT OF METHYLENE BLUE, SUBSTANTIALLY COLORLESS, AND ADAPTED FOR POLYMERIZATION.
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) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |