Patent EP0176942A1 successfully refreshed from Google Patents.
US3405091A
Expired / Lapsed
US
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Methylene diphenyl oxide polymers and methods of preparing them
Assignee: Westinghouse Electric Corp
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Filing: 1964-03-11
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Granted: 1968-10-08
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Expires: 1984-03-11
Abstract
No abstract record available.
Inventors
- 👤 Gerhard R Sprengling
- 👤 Daniel R Sassano
- 👤 Orlin D Trapp
- 👤 Leo S Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:15
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; C; C08; C08G; C08G61/00; C08G61/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR THE PRODUCTION OF A SOLUBLE AND FUSIBLE RESINOUS COMPOSITION WHICH COMPRISES THE STEPS OF (1) MIXING TOGETHER (A) AN ESSENTIALLY MONOMERIC HALOMETHYLDIPHENYL OXIDE WHEREIN THE AVERAGE NUMBER OF HALOMETHYL GROUPS PER DIPHENYL OXIDE MOIETY IS FROM ABOUT 0.6 TO ABOUT 3.0, (B) AN AMOUNT OF DIPHENYL OXIDE TO PROVIDE A PRODUCT FUNCTIONALITY (FN)>0.75 AND (C) A CONDENSATION CATALYST SELECTED FROM THE GROUP CONSISTING OF FRIEDEL-CRAFTS CATALYSTS, SILICA, DIATOMACEOUS EARTH, BENTONITE, ORGANIC SOLUBLE METALLIC CHELATES, AND P-TOLUENE SULFONIC ACID, (2) HEATING THE MIXTURE OF (A), (B), AND (C) UNTIL SUBSTANTIALLY ALL OF THE HALOGEN HAS REACTED AND (3) STRIPPING OFF ANY RESIDUAL DIPHENYL-OXIDE.
Claim 2
Dependent Claim
105 words
A PROCESS FOR THE PRODUCTION OF A SOLUBLE AND FUSIBLE RESINOUS COMPOSITION WHICH COMPRISES THE STEPS OF (1) MIXING TOGETHER (A) AN ESSENTIALLY MONOMERIC HALOMETHYLDIPHENYL OXIDE WHEREIN THE AVERAGE NUMBER OF HALOMETHYL GROUPS PER DIPHENYL OXIDE MOIETY IS FROM ABOUT 0.6 TO ABOUT 3.0, (B) AN AMOUNT OF DIPHENYL OXIDE TO PROVIDE A PRODUCT FUNCTIONALITY (FN)>0.75 AND (C) A CONDENSATION CATALYST SELECTED FROM THE GROUP CONSISTING OF FRIEDEL-CRAFTS CATALYSTS, SILICA, DIATOMACEOUS EARTH, BENTONITE, ORGANIC SOLUBLE METALLIC CHELATES, AND P-TOLUENE SULFONIC ACID, (2) HEATING THE MIXTURE OF (A), (B), AND (C) UNTIL SUBSTANTIALLY ALL OF THE HALOGEN HAS REACTED AND (3) STRIPPING OFF ANY RESIDUAL DIPHENYL-OXIDE.
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) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |