Patent US3122525A successfully refreshed from Google Patents.
US3122525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyoxymethylenes
Assignee: Evonik Operations GmbH
•
Filing: 1961-05-11
•
Granted: 1964-02-25
•
Expires: 1981-05-11
Abstract
No abstract record available.
Inventors
- 👤 Werner Kern
- 👤 Volker Jaacks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:19
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08G2/24; C08G2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS FOR THE PRODUCTION OF POLYOXYMETHYLENES WHICH COMPRISES POLYMERIZING AN ESSENTIALLY WATER FREE FORMALDEHYDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOMERIC FORMALDEHYDE AND TRIOXANE IN CONTACT WITH A CATALYTIC AMOUNT OF INITIATOR SELECTED FROM THE GROUP CONSISTING OF (1) ORGANIC ESTERS OF PERCHLORIC ACID AND (2) MIXED ANHYDRIDES OF PERCHLORIC ACID AND AN ORGANIC CARBOXLIC ACID, SAID PERCHLORIC ACID AND SAID ORGANIC CABOXYLIC ACID BENG THE COMPONENTS OF SAID MIXED ANHYDRIDES.
Claim 2
Dependent Claim
73 words
A PROCESS FOR THE PRODUCTION OF POLYOXYMETHYLENES WHICH COMPRISES POLYMERIZING AN ESSENTIALLY WATER FREE FORMALDEHYDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOMERIC FORMALDEHYDE AND TRIOXANE IN CONTACT WITH A CATALYTIC AMOUNT OF INITIATOR SELECTED FROM THE GROUP CONSISTING OF (1) ORGANIC ESTERS OF PERCHLORIC ACID AND (2) MIXED ANHYDRIDES OF PERCHLORIC ACID AND AN ORGANIC CARBOXLIC ACID, SAID PERCHLORIC ACID AND SAID ORGANIC CABOXYLIC ACID BENG THE COMPONENTS OF SAID MIXED ANHYDRIDES.
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) | 1967-02-24 | 1967-08-26 | 1968-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-24 | 1971-08-26 | 1972-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-24 | 1975-08-26 | 1976-02-25 | $7700.00 | Window Closed / Lapsed |