US3137643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing isoolefins
Assignee: Shell USA Inc
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Filing: 1959-12-14
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Granted: 1964-06-16
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Expires: 1979-12-14
Abstract
No abstract record available.
Inventors
- 👤 Edward R Bell
- 👤 William S Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:11
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
AN IMPROVED POLYMERIZATION PROCESS WHICH COMPRISES PROVIDIN A LIQUID REACTION MASS CONTAINING AS SOLE POLYMERIZABLE INGREDIENTS AN ISOOLEFIN AND AT MOST 10 MOLE PERCENT OF OTHER ETHYLENICALLY UNSATUREATED MONOMERS AT A TEMPERATURE BETWEEN -70*C. AND -180*C., SAID REACTION MASS BEING INCONTACT WITH AN INERT ATMOSPHERE, AND EXPOSING SAID REACTION MASS IN AN IRRADIATION ZONE TO NO MORE THAN 5X10**7 RADS OF HIGH ENERGY IONIZING RADIATION OF SUBSTANTIAL PENETRATING POWER FROM AN EXTERNAL SOURCE WHILE IT IS MAINTAINED INCONDENSED PHASE AT A TEMPERATURE IN SAID RANGE AND UNDER SUFFICIENT AGITAITION OF EXPOSED LIQUID TO PREVENT SKIN FORMATION, WITH DRAWING THE RESULTING PARTICLES OF SOLID POLYMER FROMTHE IRRADIATION ZONE AS THEY ARE FORMED AND RECOVERING A RUBBERY POLYMER OF AT LEAST ABOUT 100,000 MOLECULAR WEIGHT.
Claim 2
Dependent Claim
123 words
AN IMPROVED POLYMERIZATION PROCESS WHICH COMPRISES PROVIDIN A LIQUID REACTION MASS CONTAINING AS SOLE POLYMERIZABLE INGREDIENTS AN ISOOLEFIN AND AT MOST 10 MOLE PERCENT OF OTHER ETHYLENICALLY UNSATUREATED MONOMERS AT A TEMPERATURE BETWEEN -70*C. AND -180*C., SAID REACTION MASS BEING INCONTACT WITH AN INERT ATMOSPHERE, AND EXPOSING SAID REACTION MASS IN AN IRRADIATION ZONE TO NO MORE THAN 5X10**7 RADS OF HIGH ENERGY IONIZING RADIATION OF SUBSTANTIAL PENETRATING POWER FROM AN EXTERNAL SOURCE WHILE IT IS MAINTAINED INCONDENSED PHASE AT A TEMPERATURE IN SAID RANGE AND UNDER SUFFICIENT AGITAITION OF EXPOSED LIQUID TO PREVENT SKIN FORMATION, WITH DRAWING THE RESULTING PARTICLES OF SOLID POLYMER FROMTHE IRRADIATION ZONE AS THEY ARE FORMED AND RECOVERING A RUBBERY POLYMER OF AT LEAST ABOUT 100,000 MOLECULAR WEIGHT.
References Cited (Backward Citations)
GB665262A
Cited
US2982762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |