Patent US3303167A successfully refreshed from Google Patents.
US3303167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic hydrocarbon-formaldehyde resinous condensation products and process for producing the same
Assignee: Sumitomo Bakelite Co Ltd
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Filing: 1964-12-30
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Granted: 1967-02-07
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Expires: 1984-12-30
Abstract
No abstract record available.
Inventors
- 👤 Kakiuchi Hiroshi
- 👤 Sato Hideo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:16
CPC Classifications
C; C08; C08G; C08G10/00; C08G10/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
168 words
A PROCESS FOR PRODUCING CONDENSATION PRODUCTS CONTANING 7 TO 20% OF OXYGEN BY WEIGHT, WHICH COMPRISES CONDENSING AT LEAST ONE AROMATIC HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF BENZENE AND TOLUENE WITH A POLYMERIC FORALDEHYDE HAVING A POLYMERIZATION DEGREE OF BETWEEN 10 AND 3,000, SAID POLYMERIC FORMALDEHYDE BEING PRESENT IN AN AMOUNT FROM 1 TO 5 MOLES, EXPRESSED IN FORMALDEHYDE MONOMER UNIT, PER MOLE OF SAID AROMATIC HYDROCARBON, IN THE PRESENCE OF SULFURIC ACID IN AN AMOUNT OF 0.1 TO 1.0 MOLE PER MOLE OF SAID AROMATIC HYDROCARBON, OR PERCHLORIC ACID IN AN AMOUNT OF 0.06 TO 0.2 MOLE PER MOLE OF SAID AROMATIC HYDROCARBON AS THE CATALYSTS, AND ALSO IN THE PRESENCE OF WATER IN AN AMOUNT OF 3 TO 15% BY WEIGHT AT THE BEGINNING OF THE REACTION AT 70% TO 120%C. FOR 2 TO 10 HOURS, UNDER NON-AZEOTROPIC CONDITIONS, WHEREBY A POLYMERIC CONDENSATION PRODUCT OF SAID AROMATIC HYDROCARBON AND SAID FORMALDEHYDE IS FORMED HAVING BETWEEN 7 AND 20% OF OXYGEN, AND RECOVERING SAID POLYMERIC PRODUCT.
Claim 2
Dependent Claim
168 words
A PROCESS FOR PRODUCING CONDENSATION PRODUCTS CONTANING 7 TO 20% OF OXYGEN BY WEIGHT, WHICH COMPRISES CONDENSING AT LEAST ONE AROMATIC HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF BENZENE AND TOLUENE WITH A POLYMERIC FORALDEHYDE HAVING A POLYMERIZATION DEGREE OF BETWEEN 10 AND 3,000, SAID POLYMERIC FORMALDEHYDE BEING PRESENT IN AN AMOUNT FROM 1 TO 5 MOLES, EXPRESSED IN FORMALDEHYDE MONOMER UNIT, PER MOLE OF SAID AROMATIC HYDROCARBON, IN THE PRESENCE OF SULFURIC ACID IN AN AMOUNT OF 0.1 TO 1.0 MOLE PER MOLE OF SAID AROMATIC HYDROCARBON, OR PERCHLORIC ACID IN AN AMOUNT OF 0.06 TO 0.2 MOLE PER MOLE OF SAID AROMATIC HYDROCARBON AS THE CATALYSTS, AND ALSO IN THE PRESENCE OF WATER IN AN AMOUNT OF 3 TO 15% BY WEIGHT AT THE BEGINNING OF THE REACTION AT 70% TO 120%C. FOR 2 TO 10 HOURS, UNDER NON-AZEOTROPIC CONDITIONS, WHEREBY A POLYMERIC CONDENSATION PRODUCT OF SAID AROMATIC HYDROCARBON AND SAID FORMALDEHYDE IS FORMED HAVING BETWEEN 7 AND 20% OF OXYGEN, AND RECOVERING SAID POLYMERIC PRODUCT.
Claim 3
Dependent Claim
50 words
THE AROMATIC HYDROCARBON-FORMALDEHYDE RESIN, WHICH IS OBTAINED BY THE PROCESS AC CORDING TO CLAIM 1 AND POSSESSES AN OXYGEN CONTENT OF 7 TO 20% BY WEIGHT, A MOLECULAR WEIGHT OF 250 TO 700, A VISCOSITY OF 200 TO 80,000 CENTIPOISES (30%C.) AND A SPECIFIC GRAVITY OF 1.06 TO 1.14 (30%C.).
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |