Patent US3218296A successfully refreshed from Google Patents.
US3218296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Initiators for the polymerization of formaldehyde
Assignee: Tenneco Chemicals Inc
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Filing: 1962-07-30
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Granted: 1965-11-16
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Expires: 1982-07-30
Abstract
No abstract record available.
Inventors
- 👤 Sidi Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:21
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE WHICH CONSISTS ESSENTIALLY OF CONTACTING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE AT A TEMPERATURE IN THE RANGE OF APPROXIMATELY -100*C. TO 80*C. WITH FROM APPROXIMATELY 0.0001 PART TO 0.5 PART BY WEIGHT, BASED ON THE WEIGHT OF THE MONOMERIC FORMALDEHYDE, OF AN ESTER OF AN OXIRANE-SUBSTITUTED CARBOXYLIC ACID CONTAINING FROM 10 TO 22 CARBON ATOMS, THEREBY POLYMERIZING THE MONOMERIC FORMALDEHYDE TO A HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE.
Claim 2
Dependent Claim
74 words
THE PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE WHICH CONSISTS ESSENTIALLY OF CONTACTING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE AT A TEMPERATURE IN THE RANGE OF APPROXIMATELY -100*C. TO 80*C. WITH FROM APPROXIMATELY 0.0001 PART TO 0.5 PART BY WEIGHT, BASED ON THE WEIGHT OF THE MONOMERIC FORMALDEHYDE, OF AN ESTER OF AN OXIRANE-SUBSTITUTED CARBOXYLIC ACID CONTAINING FROM 10 TO 22 CARBON ATOMS, THEREBY POLYMERIZING THE MONOMERIC FORMALDEHYDE TO A HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |