US2551365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of formaldehyde to paraformaldehyde with alkaline catalyst
Assignee: EIDP Inc
•
Filing: 1949-03-31
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Granted: 1951-05-01
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Expires: 1969-03-31
Abstract
No abstract record available.
Inventors
- 👤 Robert L Craven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:40
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/08; C08G2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE PROCESS FOR THE PRODUCTION OF PARAFORMALDEHYDE WHICH COMPRISES ADDING TO AN AQUEOUS FORMALDEHYDE HAVING A CONCENTRATION OF 75% TO 90% FORMALDEHYDE AND HAVING TEMPERATURE OF 80* C. TO 110* C., 0.01% TO 1.0% OF AN ALKALINE CATALYST TAKEN FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM HYDROXIDES, CARBONATES, FORMATES, AND ACETATES, AND AGITATING THE RESULTING COMPOSITION.
Claim 2
Dependent Claim
57 words
THE PROCESS FOR THE PRODUCTION OF PARAFORMALDEHYDE WHICH COMPRISES ADDING TO AN AQUEOUS FORMALDEHYDE HAVING A CONCENTRATION OF 75% TO 90% FORMALDEHYDE AND HAVING TEMPERATURE OF 80* C. TO 110* C., 0.01% TO 1.0% OF AN ALKALINE CATALYST TAKEN FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM HYDROXIDES, CARBONATES, FORMATES, AND ACETATES, AND AGITATING THE RESULTING COMPOSITION.
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) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |