Patent US2848437A successfully refreshed from Google Patents.
US2848437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metalorganic compounds as initiators for the polymerization of formaldehyde
Assignee: EIDP Inc
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Filing: 1954-04-16
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Granted: 1958-08-19
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Expires: 1974-04-16
Abstract
No abstract record available.
Inventors
- 👤 Jr William P Langsdorf
- 👤 Gelu S Stamatoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:42
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; C08G2/30; C08G2/32; Y; Y10; Y10S; Y10S74/00; Y10S74/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT ADDITION POLYMER OF FORMALDEHYDE COMPRISING CONTACTING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE WITH A POLYMERIZATION INITIATOR WHICH IS A METALORGANIC COMPOUND, IN WHICH THE METAL HAS A VALENCE FROM 1 TO 4, AND IS A MEMBER OF THE GROUP CONSISTING OF METAL HYDRIDES, METAL ALKYLS, METAL CYCLOALKYLS, METAL ARYLS, METAL ALCOHOLATES, METAL MERCAPTIDES, METAL CARBOXYLATES, ALKYL METAL HALIDES, CYCLOALKYL METAL HALIDES, ARYL METAL HALIDES, ALKOXY METAL HALIDES, CYCLOALKOXY METAL HALIDES, ARYLOXY METAL HALIDES, ALKYLTHIO METAL HALIDES, CYCLOALKYLTHIO METAL HALIDES, AND ARYLTHIO METAL HALIDES, AND RECOVERING A HIGH MOLECULAR WEIGHT ADDITION POLYMER OF FORMALDEHYDE.
Claim 2
Dependent Claim
99 words
A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT ADDITION POLYMER OF FORMALDEHYDE COMPRISING CONTACTING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE WITH A POLYMERIZATION INITIATOR WHICH IS A METALORGANIC COMPOUND, IN WHICH THE METAL HAS A VALENCE FROM 1 TO 4, AND IS A MEMBER OF THE GROUP CONSISTING OF METAL HYDRIDES, METAL ALKYLS, METAL CYCLOALKYLS, METAL ARYLS, METAL ALCOHOLATES, METAL MERCAPTIDES, METAL CARBOXYLATES, ALKYL METAL HALIDES, CYCLOALKYL METAL HALIDES, ARYL METAL HALIDES, ALKOXY METAL HALIDES, CYCLOALKOXY METAL HALIDES, ARYLOXY METAL HALIDES, ALKYLTHIO METAL HALIDES, CYCLOALKYLTHIO METAL HALIDES, AND ARYLTHIO METAL HALIDES, AND RECOVERING A HIGH MOLECULAR WEIGHT ADDITION POLYMER OF FORMALDEHYDE.
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) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |