Patent US2111277A successfully refreshed from Google Patents.
Patent US2813850A successfully refreshed from Google Patents.
US2813850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing unsaturated compounds in an aqueous medium
Assignee: Shell Development Co
•
Filing: 1952-01-07
•
Granted: 1957-11-19
•
Expires: 1972-01-07
Abstract
No abstract record available.
Inventors
- 👤 Christiaan Pieter Van Dijk
- 👤 Franciscus Johannes Freder Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:29
CPC Classifications
B; B01; B01J; B01J10/00; B01J19/00; B01J19/24; B01J19/2455; B01J19/246; Y; Y10; Y10S; Y10S526/00; Y10S526/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A PROCESS FOR PRODUCING A POLYMER OF AT LEAST ONE SUBSTANTIALLY WATER-INSOLUBLE ETHYLENICALLY UNSATURATED COMPOUND IN AN AQUEOUS MEDIUM WHEREIN LIQUID DROPS OF THE SAID ETHYLENICALLY UNSATURATED COMPOUND ARE PASSED THROUGH A LIQUID AQUEOUS MEDIUM WHICH IS MAINTAINED AT A POLYMERIZING TEMPERATURE AND CONTAINS A WATER-SOLUBLE POLYMERIZATION CATALYST AND DISPERSED POLYMER OF THE ETHYLENICALLY UNSATURATED COMPOUND SUSPENDED THEREIN BY THE PRESENCE OF SUFFICIENT EMULSIFYING AGENT THAT THE POLYMER EMULSION IS SUBSTANTIALLY STABLE, AND A PORTION OF THE MONOMER ON THE SURFACE OF THE DROPS GOES INTO THE AQUEOUS MEDIUM AND IS POLYMERIZED, SAID PASSAGE OF THE DROPS OF THE ETHYLENICALLY UNSATURATED COMPOUND THROUGH THEE AQUEOUS MEDIUM BEING DUE PRIMARILY TO THE DIFFERENCE IN DENSITY OF THE SAID DROPS AND MEIDUM AND WHEREIN ALL OF THE DROPS THAT PASS THROUGH THE AQUEOUS PHASE ARE COLLECTED AS A SEPARATE PHASE IN CONTACT WITH THE SAID
Claim 2
Dependent Claim
144 words
IN A PROCESS FOR PRODUCING A POLYMER OF AT LEAST ONE SUBSTANTIALLY WATER-INSOLUBLE ETHYLENICALLY UNSATURATED COMPOUND IN AN AQUEOUS MEDIUM WHEREIN LIQUID DROPS OF THE SAID ETHYLENICALLY UNSATURATED COMPOUND ARE PASSED THROUGH A LIQUID AQUEOUS MEDIUM WHICH IS MAINTAINED AT A POLYMERIZING TEMPERATURE AND CONTAINS A WATER-SOLUBLE POLYMERIZATION CATALYST AND DISPERSED POLYMER OF THE ETHYLENICALLY UNSATURATED COMPOUND SUSPENDED THEREIN BY THE PRESENCE OF SUFFICIENT EMULSIFYING AGENT THAT THE POLYMER EMULSION IS SUBSTANTIALLY STABLE, AND A PORTION OF THE MONOMER ON THE SURFACE OF THE DROPS GOES INTO THE AQUEOUS MEDIUM AND IS POLYMERIZED, SAID PASSAGE OF THE DROPS OF THE ETHYLENICALLY UNSATURATED COMPOUND THROUGH THEE AQUEOUS MEDIUM BEING DUE PRIMARILY TO THE DIFFERENCE IN DENSITY OF THE SAID DROPS AND MEIDUM AND WHEREIN ALL OF THE DROPS THAT PASS THROUGH THE AQUEOUS PHASE ARE COLLECTED AS A SEPARATE PHASE IN CONTACT WITH THE SAID
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) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |