US3118747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying gaseous formaldehyde
Assignee: Societa Italiana Resine SpA SIR
•
Filing: 1960-12-30
•
Granted: 1964-01-21
•
Expires: 1980-12-30
Abstract
No abstract record available.
Inventors
- 👤 Codignola Franco
- 👤 Christopher G A Clayton
- 👤 Ackermann Jakob
- 👤 Gerhard K E Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:35
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/04; B01J39/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD OF PURIFYING MONOMERIC FORMALDEHYDE CONTAINING IMPURITIES COMPRISING WATER, METHYL ALCOHOL, FORMIC ACID AND MUTUAL REACTION PRODUCTS THEREOF, SAID METHOD COMPRISING CONTACTING THE IMPURE MONOMERIC FORMALDEHYDE IN A GASEOUS CONDITION WITH AN ADSORBENT SELECTED FROM THE GROUP CONSISTING OF POLYLACTIC ACID, POLYPHOSPHORIC ACID, SULFONATED POLYSTYRENE RESIN, SULFONATED PHENOLIC RESIN AND CROSS-LINKED POLYACRYLIC ACID AT A TEMPERATURE SELECTED IN THE RANGE OF -20*C. TO +150*C., AND REGENERATING THE EXHAUSTED ADSORBENT BY STRIPPING BY MEANS OF AN INERT GAS AT A TEMPERATURE HIGHER THAN THAT SELECTED FOR ADSORPTION.
Claim 2
Independent Claim
87 words
A METHOD OF PURIFYING MONOMERIC FORMALDEHYDE CONTAINING IMPURITIES COMPRISING WATER, METHYL ALCOHOL, FORMIC ACID AND MUTUAL REACTION PRODUCTS THEREOF, SAID METHOD COMPRISING CONTACTING THE IMPURE MONOMERIC FORMALDEHYDE IN A GASEOUS CONDITION WITH AN ADSORBENT SELECTED FROM THE GROUP CONSISTING OF POLYLACTIC ACID, POLYPHOSPHORIC ACID, SULFONATED POLYSTYRENE RESIN, SULFONATED PHENOLIC RESIN AND CROSS-LINKED POLYACRYLIC ACID AT A TEMPERATURE SELECTED IN THE RANGE OF -20*C. TO +150*C., AND REGENERATING THE EXHAUSTED ADSORBENT BY STRIPPING BY MEANS OF AN INERT GAS AT A TEMPERATURE HIGHER THAN THAT SELECTED FOR ADSORPTION.
References Cited (Backward Citations)
US2875606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |