Patent US3352828A successfully refreshed from Google Patents.
US3352828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl carbamates containing nf2 groups and processes for producing same
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1960-12-21
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Granted: 1967-11-14
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Expires: 1980-12-21
Abstract
No abstract record available.
Inventors
- 👤 Anthony J Passannante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:38
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A POLYVINYL CARBAMATE CONTAINING NF2 GROUPS CHARACTERIZED BY THE RECURRING UNIT:
Claim 2
Dependent Claim
11 words
A POLYVINYL CARBAMATE CONTAINING NF2 GROUPS CHARACTERIZED BY THE RECURRING UNIT:
Claim 3
Dependent Claim
117 words
A PROCESS FOR MODIFYING POLYVINYL ALCOHOL TO FORM AS A PRODUCT A POLYVINYL CARBAMATE HAVING NF2 CONSTITUENTS WHICH COMPRISES (I) REACTING IN THE PRESENCE OF A LIQUID ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF NITROBENZENE, ACETONITRILE, TETRAHYDRFURAN, DIMETHYL FORMAMIDE, AND MIXTURES THEREOF (I) A POLYVINYL ALCOHOL WITH (II) SUFFICIENT ISOCYANATE-N2F4 ADDUCT TO REACT MORE THAN 50% OF THE HYDROXYL GROUPS IN SAID POLYVINYL ALCOHOL, SAID ISOCYANATE-N2F4 ADDUCT BEING SELECTED FROM THE GROUP CONSISTING OF (A) ALKYL ISOCYANATES HAVING 2 TO 6 CARBON ATOMS WITH 1 NF2 GROUP PER CARBON ATOM AND (B) FURYL ISOCYANATE HAVING AN NF2 GROUP LINKED TO EACH CARBON ATOM AND (II) RECOVERING AS A RESULTING PRODUCT A POLYVINYL CARBAMATE CONTAINING NF2 GROUPS.
Claim 4
Dependent Claim
117 words
A PROCESS FOR MODIFYING POLYVINYL ALCOHOL TO FORM AS A PRODUCT A POLYVINYL CARBAMATE HAVING NF2 CONSTITUENTS WHICH COMPRISES (I) REACTING IN THE PRESENCE OF A LIQUID ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF NITROBENZENE, ACETONITRILE, TETRAHYDRFURAN, DIMETHYL FORMAMIDE, AND MIXTURES THEREOF (I) A POLYVINYL ALCOHOL WITH (II) SUFFICIENT ISOCYANATE-N2F4 ADDUCT TO REACT MORE THAN 50% OF THE HYDROXYL GROUPS IN SAID POLYVINYL ALCOHOL, SAID ISOCYANATE-N2F4 ADDUCT BEING SELECTED FROM THE GROUP CONSISTING OF (A) ALKYL ISOCYANATES HAVING 2 TO 6 CARBON ATOMS WITH 1 NF2 GROUP PER CARBON ATOM AND (B) FURYL ISOCYANATE HAVING AN NF2 GROUP LINKED TO EACH CARBON ATOM AND (II) RECOVERING AS A RESULTING PRODUCT A POLYVINYL CARBAMATE CONTAINING NF2 GROUPS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |