Patent US3002952A successfully refreshed from Google Patents.
US3002952A
Expired / Lapsed
US
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Initiators for the polymerization of formaldehyde
Assignee: EIDP Inc
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Filing: 1959-09-22
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Granted: 1961-10-03
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Expires: 1979-09-22
Abstract
No abstract record available.
Inventors
- 👤 O'connor Timothy Edmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:01
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS FOR PREPARING HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE WHICH COMPRISES CONTACTING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE IN AN INERT LIQUID REACTION MEDIUM WITH 1-1000 MILLIGRAMS PER LITER OF SAID REACTION MEDIUM OF A POLYMERIZATION INITIATOR CONSISTING ESSENTIALLY OF A TERTIARY AMINE SALT OF A FRIEDEL-CRAFTS METAL HALIDE AT A TEMPERATURE OF -110* TO 100*C. AND RECOVERING HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE FORMED THEREBY.
Claim 2
Dependent Claim
61 words
A PROCESS FOR PREPARING HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE WHICH COMPRISES CONTACTING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE IN AN INERT LIQUID REACTION MEDIUM WITH 1-1000 MILLIGRAMS PER LITER OF SAID REACTION MEDIUM OF A POLYMERIZATION INITIATOR CONSISTING ESSENTIALLY OF A TERTIARY AMINE SALT OF A FRIEDEL-CRAFTS METAL HALIDE AT A TEMPERATURE OF -110* TO 100*C. AND RECOVERING HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE FORMED THEREBY.
References Cited (Backward Citations)
GB793673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |