Patent US3219630A successfully refreshed from Google Patents.
US3219630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of branched chain polyoxymethylene polycarboxylates
Assignee: Tenneco Chemicals Inc
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Filing: 1961-08-25
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Granted: 1965-11-23
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Expires: 1981-08-25
Abstract
No abstract record available.
Inventors
- 👤 Sidi Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:47
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/04; C08G2/08; C08G2/10; C08G2/18; C08G2/20; C08G2/22; C08G2/24; C08G2/30; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT POLYMERS OF FORMALDEHYDE WHICH COMPRISES CONTACTING A FORMALDEHYDE SOURCE SELECTED FROM THE GROUP CONSISTING OF MONOMERIC FORMALDEHYDE AND TRIOXANE WITH A POLYMERIZATION INITIATOR IN THE PRESENCE OF AN ALKYLENE DICARBOXYLATE HAVING A STRUCTURE REPRESNTED BY THE FORMULA
Claim 2
Dependent Claim
46 words
THE PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT POLYMERS OF FORMALDEHYDE WHICH COMPRISES CONTACTING A FORMALDEHYDE SOURCE SELECTED FROM THE GROUP CONSISTING OF MONOMERIC FORMALDEHYDE AND TRIOXANE WITH A POLYMERIZATION INITIATOR IN THE PRESENCE OF AN ALKYLENE DICARBOXYLATE HAVING A STRUCTURE REPRESNTED BY THE FORMULA
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |