US3030338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of formaldehyde
Assignee: Individual
•
Filing: 1959-01-26
•
Granted: 1962-04-17
•
Expires: 1979-01-26
Abstract
No abstract record available.
Inventors
- 👤 Robert S Aries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:04
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE METHOD OF PURIFYING MONOMERIC FORMALDEHYDE WHICH COMPRISES POLYMERIZING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE IN CONTACT WITH FINELY DIVIDED SILICA SUSPENDED IN AN INERT ORGANIC LIQUID WHICH IS A SOLVENT FOR THE MONOMER BUT NOT FOR THE POLYMER UNTIL NOT MORE THAN ABOUT 1% HAS BEEN CONVERTED TO POLYMER, AND SEPARATING THE POLYMER.
Claim 2
Independent Claim
52 words
THE METHOD OF PURIFYING MONOMERIC FORMALDEHYDE WHICH COMPRISES POLYMERIZING SUBSTANTIALLY ANHYDROUS MONOMERIC FORMALDEHYDE IN CONTACT WITH FINELY DIVIDED SILICA SUSPENDED IN AN INERT ORGANIC LIQUID WHICH IS A SOLVENT FOR THE MONOMER BUT NOT FOR THE POLYMER UNTIL NOT MORE THAN ABOUT 1% HAS BEEN CONVERTED TO POLYMER, AND SEPARATING THE POLYMER.
References Cited (Backward Citations)
US1864908A
Cited
US2841570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |