Patent US3216217A successfully refreshed from Google Patents.
Patent US2914511A successfully refreshed from Google Patents.
US2914511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of quinodimethanes and sulfur dioxide
Assignee: 3M Co
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Filing: 1956-03-05
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Granted: 1959-11-24
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Expires: 1976-03-05
Abstract
No abstract record available.
Inventors
- 👤 Louis A Errede
- 👤 Billy F Landrum
- 👤 Horace R Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:42
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE PROCESS WHICH COMPRISES INTERACTING SULFUR DIOXIDE WITH A QUINODIMETHANE SELECTED FROM THE GROUP CONSISTING OF P-QUINODIMETHANE, 1,4-NAPHTHAQUINODIMETHANE AND CORRESPONDING HETEROCYCLIC QUINODIMETHANES CONTAINING AT LEAST ONE HETERONITROGEN ATOM VICINAL ONLY TO CARBON ATOMS AND THE NUCLEAR SUBSTITUTION PRODUCTS OF THE FOREGOING MEMBERS WITH THE ATOMS OF THE NORMALLY GASEOUS HALOGENS AND METHYL GROUPS AT A TEMPERATURE BETWEEN ABOUT -120*C. AND ABOUT 30*C. SO THAT A SULFUR-CONTAINING POLYMER HAVING A RECURRING AROMATICALLY UNSATURATED NUCLEUS IS PRODUCED.
Claim 2
Dependent Claim
75 words
THE PROCESS WHICH COMPRISES INTERACTING SULFUR DIOXIDE WITH A QUINODIMETHANE SELECTED FROM THE GROUP CONSISTING OF P-QUINODIMETHANE, 1,4-NAPHTHAQUINODIMETHANE AND CORRESPONDING HETEROCYCLIC QUINODIMETHANES CONTAINING AT LEAST ONE HETERONITROGEN ATOM VICINAL ONLY TO CARBON ATOMS AND THE NUCLEAR SUBSTITUTION PRODUCTS OF THE FOREGOING MEMBERS WITH THE ATOMS OF THE NORMALLY GASEOUS HALOGENS AND METHYL GROUPS AT A TEMPERATURE BETWEEN ABOUT -120*C. AND ABOUT 30*C. SO THAT A SULFUR-CONTAINING POLYMER HAVING A RECURRING AROMATICALLY UNSATURATED NUCLEUS IS PRODUCED.
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) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |