Patent US3306877A successfully refreshed from Google Patents.
US3306877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of copolyacetals
Assignee: Hoechst AG
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Filing: 1963-06-24
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Granted: 1967-02-28
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Expires: 1983-06-24
Abstract
No abstract record available.
Inventors
- 👤 Schott Claus
- 👤 Fischer Edgar
- 👤 Roos Gunther
- 👤 Bier Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:22
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/18; C08G2/22; C08G2/24; C08G2/26; C08J; C08J9/00; C08J9/02; C08J2359/00; C08J2359/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
A PROCESS FOR THE MANUFACTURE OF THREE-DIMENSIONALLY CROSS-LINKED COPOLYMERS, WHICH COMPRISES POLYMERIZING, WITHIN A TEMPERATURE RANGE OF FROM -50*C. TO +100*C. AND IN ADMIXTURE WITH A CATIONICALLY ACTIVE CATALYST, 99.9 TO 80 PERCENT BY WEIGHT, CALCULATED ON THE TOTAL MONOMER MIXTURE, OF TRIOXANE AND 0.1 TO 20 PERCENT BY WEIGHT, CALCULATED ON THE TOTAL MONOMER MIXTURE, OF A BIFUNCTIONAL DIMETHYLOL ACETAL OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF A SATURATED ALDEHYDE CONTAINING 1 TO 4 CARBON ATOMS, AN OLEFINICALLY UNSATURATED ALDEHYDE AND A HALOGEN-SUBSTITUTED SATURATED ALDEHYDE CONTAINING 1 TO 4 CARBON ATOMS, THE METHYLOL GROUPS OF SAID BIFUNCTIONAL DIMETHYLOL ACETAL BEING SUBSTITUTED BY AN EPOXIDE GROUPCONTAINING RADICAL, SELECTED FROM THE GROUP CONSISTING OF AN ALIPHATIC HYDROCARBON RADICAL CONTAINING 2 TO 8 CARBON ATOMS AND A CYCLOALIPHATIC HYDROCARBON RADICAL CONTAINING 5 TO 8 CARBON ATOMS.
Claim 2
Dependent Claim
136 words
A PROCESS FOR THE MANUFACTURE OF THREE-DIMENSIONALLY CROSS-LINKED COPOLYMERS, WHICH COMPRISES POLYMERIZING, WITHIN A TEMPERATURE RANGE OF FROM -50*C. TO +100*C. AND IN ADMIXTURE WITH A CATIONICALLY ACTIVE CATALYST, 99.9 TO 80 PERCENT BY WEIGHT, CALCULATED ON THE TOTAL MONOMER MIXTURE, OF TRIOXANE AND 0.1 TO 20 PERCENT BY WEIGHT, CALCULATED ON THE TOTAL MONOMER MIXTURE, OF A BIFUNCTIONAL DIMETHYLOL ACETAL OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF A SATURATED ALDEHYDE CONTAINING 1 TO 4 CARBON ATOMS, AN OLEFINICALLY UNSATURATED ALDEHYDE AND A HALOGEN-SUBSTITUTED SATURATED ALDEHYDE CONTAINING 1 TO 4 CARBON ATOMS, THE METHYLOL GROUPS OF SAID BIFUNCTIONAL DIMETHYLOL ACETAL BEING SUBSTITUTED BY AN EPOXIDE GROUPCONTAINING RADICAL, SELECTED FROM THE GROUP CONSISTING OF AN ALIPHATIC HYDROCARBON RADICAL CONTAINING 2 TO 8 CARBON ATOMS AND A CYCLOALIPHATIC HYDROCARBON RADICAL CONTAINING 5 TO 8 CARBON ATOMS.
Claim 3
Dependent Claim
18 words
A THREE-DIMENSIONALLY CROSS-LINKED COPOLYMER PREPARED FROM TRIOXANE AND A BIFUNCTIONAL DIMETHYLOL ACETAL BY THE PROCESS OF CLAIM 1.
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |