Patent US2769786A successfully refreshed from Google Patents.
US2769786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polymers from aromatic and the like compounds
Assignee: MW Kellogg Co
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Filing: 1952-08-28
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Granted: 1956-11-06
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Expires: 1972-08-28
Abstract
No abstract record available.
Inventors
- 👤 Szwarc Michael Mojzesz
- 👤 Roper Alec Norman
- 👤 Steiner Herbert Max Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:54
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/025; C08G2261/00; C08G2261/30; C08G2261/34; C08G2261/342; C08G2261/3424
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
135 words
IN THE PRODUCTION OF POLYMERIC PRODUCTS IN THE FORM OF FLAKES, THE PROCESS WHICH COMPRISES PYROLYZING THE VAPORS OF A POLYMETHYL BENZENE HAVING TWO METHYL SUBSTITUENTS IN THE PARA POSITIONS AND AT LEAST ONE ADDITIONAL METAL SUBSTITUENT IN THE RING, BY HEATING SAID VAPORS IN ADMIXTURE WITH STEAM IN MOLECULAR PROPORTIONS RANGING FROM ABOUT 10 TO 100 MOLES OF STEAM TO 1 MOLE OF THE POLYMETHYL BENZENE VAPORS TO A TEMPERATURE OF FROM ABOUT 700* TO 100* C. FOR A TIME RANGING FROM ABOUT 1 SECOND TO 0.02 SECOND AND UNDER A TOTAL PRESSURE OF STEAM AND POLYMETHYL BENZENE VAPORS NOT EXCEEDING 200 MM. MERCURY ABSOLUTE, COOLING THE PYROLYZED VAPORS TO A TEMPERATURE OF FROM ABOUT 50* TO 0* C. TO PRECIPITATE THE RESULTING POLYMER, WASHING AND DRYING TO RECOVER THE POLYMER IN FLAKE FORM.
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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |