US3209050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of diolefins
Assignee: Bridgestone Firestone Inc
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Filing: 1961-05-19
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Granted: 1965-09-28
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Expires: 1981-05-19
Abstract
No abstract record available.
Inventors
- 👤 Edward S Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:46
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A METHOD OF REMOVING ALPHA-ACETYLENE IMPURITIES FROM A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ISOPRENE, BUTADIENE AND PIPERYLENE, COMPRISING CONTACTING SAID MATERIAL UNDER ANHYDROUS CONDITIONS WITH TYPE 13-X MOLECULAR SIEVES HAVING CHANNELS OF A SUBSTANTIALLY UNIFORM DIAMETER OF APPROXIMATELY 10 ANGSTROM UNITS TO SELECTIVELY ABSORB SAID ALPHA-ACETYLENES FROM SAID MATERIAL, CONTINUING CONTACTING SAID MATERIAL WITH SAID MOLECULAR SIEVES UNTIL THE LATTER BECOME SUBSTANTIALLY SATURATED WITH RESPECT TO SAID ALPHA-ACETYLENE IMPURITIES, THEREAFTER DISCONTINUING CONTACT OF SAID MATERIAL WITH SAID SIEVES, AND THEN REGENERATING SAID SIEVES FOR FUTURE USE.
Claim 2
Independent Claim
88 words
A METHOD OF REMOVING ALPHA-ACETYLENE IMPURITIES FROM A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ISOPRENE, BUTADIENE AND PIPERYLENE, COMPRISING CONTACTING SAID MATERIAL UNDER ANHYDROUS CONDITIONS WITH TYPE 13-X MOLECULAR SIEVES HAVING CHANNELS OF A SUBSTANTIALLY UNIFORM DIAMETER OF APPROXIMATELY 10 ANGSTROM UNITS TO SELECTIVELY ABSORB SAID ALPHA-ACETYLENES FROM SAID MATERIAL, CONTINUING CONTACTING SAID MATERIAL WITH SAID MOLECULAR SIEVES UNTIL THE LATTER BECOME SUBSTANTIALLY SATURATED WITH RESPECT TO SAID ALPHA-ACETYLENE IMPURITIES, THEREAFTER DISCONTINUING CONTACT OF SAID MATERIAL WITH SAID SIEVES, AND THEN REGENERATING SAID SIEVES FOR FUTURE USE.
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |