US2619452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of vinyl sulfonic acids
Assignee: GAF Chemicals Corp
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Filing: 1945-12-22
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Granted: 1952-11-25
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Expires: 1965-12-22
Abstract
No abstract record available.
Inventors
- 👤 Giffin D Jones
- 👤 Carl E Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:04
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS OF PURIFYING A MONOMER SELECTED FROM THE CLASS CONSISTING OF VINYL SULFONIC ACID, A-ALKYL VINYL SULFONIC ACIDS, A-HALO VINYL SULFONIC ACIDS AND THE ESTERS, AMIDES AND ACID HALIDES OF THESE VINYL SULFONIC ACIDS WHICH COMPRISES PREVENTING THE CONTACT OF THE MONOMER WITH OXYGEN BY FLUSHING WITH NITROGEN, DISTILLING THE MONOMER IN THE DRY STATE AT LOW PRESSURE IN AN OXYGENFREE ATMOSPHERE AND MAINTAINING THE DISTILLED MONOMER OUT OF CONTACT WITH OXYGEN.
Claim 2
Dependent Claim
73 words
A PROCESS OF PURIFYING A MONOMER SELECTED FROM THE CLASS CONSISTING OF VINYL SULFONIC ACID, A-ALKYL VINYL SULFONIC ACIDS, A-HALO VINYL SULFONIC ACIDS AND THE ESTERS, AMIDES AND ACID HALIDES OF THESE VINYL SULFONIC ACIDS WHICH COMPRISES PREVENTING THE CONTACT OF THE MONOMER WITH OXYGEN BY FLUSHING WITH NITROGEN, DISTILLING THE MONOMER IN THE DRY STATE AT LOW PRESSURE IN AN OXYGENFREE ATMOSPHERE AND MAINTAINING THE DISTILLED MONOMER OUT OF CONTACT WITH OXYGEN.
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) | 1955-11-25 | 1956-05-26 | 1956-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-25 | 1960-05-26 | 1960-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-25 | 1964-05-26 | 1964-11-25 | $7700.00 | Window Closed / Lapsed |