US2529622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formaldehyde purification and polymerization with selective condensation of water vapor
Assignee: Stanolind Oil and Gas Co
•
Filing: 1947-05-22
•
Granted: 1950-11-14
•
Expires: 1967-05-22
Abstract
No abstract record available.
Inventors
- 👤 Vesta F Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:04
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/08; C07; C07C; C07C45/00; C07C45/78; C07C45/783
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A-PROCESS FOR PURIFYING AND CONCENTRATING FORMALDEHYDE WHICH COMPRISES CONTACTING A VAPOROUS STREAM CONTAINING FORMALDEHYDE AND WATER WITH AN INERT, WATER-IMMISCIBLE LIQUID AT A TEMPERATURE BELOW THE DEW POINT OF SAID VAPOROUS
Claim 2
Dependent Claim
31 words
A-PROCESS FOR PURIFYING AND CONCENTRATING FORMALDEHYDE WHICH COMPRISES CONTACTING A VAPOROUS STREAM CONTAINING FORMALDEHYDE AND WATER WITH AN INERT, WATER-IMMISCIBLE LIQUID AT A TEMPERATURE BELOW THE DEW POINT OF SAID VAPOROUS
References Cited (Backward Citations)
DE300530C
Cited
US1677730A
Cited
US1871019A
Cited
US1948069A
Cited
US2312811A
Cited
US2364377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |