US2529269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paraformaldehyde from formaldehyde-containing gas
Assignee: EIDP Inc
•
Filing: 1948-06-18
•
Granted: 1950-11-07
•
Expires: 1968-06-18
Abstract
No abstract record available.
Inventors
- 👤 Walker Joseph Frederic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:19
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE PROCESS OF PRODUCING PARAFORMALDEHYDE WHICH COMPRISES PASSING A FORMALDEHYDE-CONTAINING GAS INTO CONTACT WITH PARAFORMALDEHYDE PARTICLES AT A TEMPERATURE ABOVE THE DEW-POINT TEMPERATURE OF THE GAS BUT BELOW THE TEMPERATURE AT WHICH THE PARTIAL PRESSURE OF THE FORMALDEHYDE IN THE GAS EQUALS THE DECOMPOSITION PRESSURE OF PARAFORMALDEHYDE, SAID GAS CONSISTING ESSENTIALLY OF FORMALDEHYDE, WATER, VAPOR AND GASEOUS SUBSTANTIALLY INERT MATERIAL, THE LATTER CONTAINING LESS THAN ABOUT 5% BY WEIGHT OF THE FORMALEDEHYDE OF GAS THAT IS CONSENSABLE BETWEEN ROOM TEMPERATURE AND THE TEMPERATURE OF OPERATION, AND CONTAINING SUFFICIENT FORMALDEHYDE THAT THE PARTIAL PRESSURE OF THE FORMALDEHYDE WILL BE ABOVE THE DECOMPOSITION PRESSURE OF PARAFORMALDEHYDE AT A TEMPERATURE ABOVE THE DEW-POINT TEMPERATURE OF THE GAS.
Claim 2
Dependent Claim
114 words
THE PROCESS OF PRODUCING PARAFORMALDEHYDE WHICH COMPRISES PASSING A FORMALDEHYDE-CONTAINING GAS INTO CONTACT WITH PARAFORMALDEHYDE PARTICLES AT A TEMPERATURE ABOVE THE DEW-POINT TEMPERATURE OF THE GAS BUT BELOW THE TEMPERATURE AT WHICH THE PARTIAL PRESSURE OF THE FORMALDEHYDE IN THE GAS EQUALS THE DECOMPOSITION PRESSURE OF PARAFORMALDEHYDE, SAID GAS CONSISTING ESSENTIALLY OF FORMALDEHYDE, WATER, VAPOR AND GASEOUS SUBSTANTIALLY INERT MATERIAL, THE LATTER CONTAINING LESS THAN ABOUT 5% BY WEIGHT OF THE FORMALEDEHYDE OF GAS THAT IS CONSENSABLE BETWEEN ROOM TEMPERATURE AND THE TEMPERATURE OF OPERATION, AND CONTAINING SUFFICIENT FORMALDEHYDE THAT THE PARTIAL PRESSURE OF THE FORMALDEHYDE WILL BE ABOVE THE DECOMPOSITION PRESSURE OF PARAFORMALDEHYDE AT A TEMPERATURE ABOVE THE DEW-POINT TEMPERATURE OF THE GAS.
References Cited (Backward Citations)
US2125375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |