US2568018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of paraformaldehyde
Assignee: Celanese Corp
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Filing: 1949-10-28
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Granted: 1951-09-18
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Expires: 1969-10-28
Abstract
No abstract record available.
Inventors
- 👤 Alexander F Maclean
- 👤 Walter E Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:51
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
PROCESS FOR THE DRYING OF PARAFORMALDEHYDE, WHICH COMPRISES TREATING PARAFORMALDEHYDE IN PARTICLE FORM WITH A CURRENT OF AIR CONTAINING TRIETHYLAMINE IN AN AMOUNT SUFFICIENT TO ALTER THE PH OF THE PARAFORMALDEHYDE, DRYING THE PARTICLES SO TREATED, REDUCING THE PARTICLE SIZE OF THE PARAFORMALDEHYDE PARTICLES, AND THEN DRYING THE FINELY-DIVIDED PARTICLES TO A MOISTURE CONTENT BELOW 3% BY WEIGHT WITH A CURRENT OF HEATED AIR CONTAINING MOISTURE.
Claim 2
Dependent Claim
66 words
PROCESS FOR THE DRYING OF PARAFORMALDEHYDE, WHICH COMPRISES TREATING PARAFORMALDEHYDE IN PARTICLE FORM WITH A CURRENT OF AIR CONTAINING TRIETHYLAMINE IN AN AMOUNT SUFFICIENT TO ALTER THE PH OF THE PARAFORMALDEHYDE, DRYING THE PARTICLES SO TREATED, REDUCING THE PARTICLE SIZE OF THE PARAFORMALDEHYDE PARTICLES, AND THEN DRYING THE FINELY-DIVIDED PARTICLES TO A MOISTURE CONTENT BELOW 3% BY WEIGHT WITH A CURRENT OF HEATED AIR CONTAINING MOISTURE.
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) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |