US2593862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for polymerization of formaldehyde and recovery of paraformaldehyde
Assignee: Individual
•
Filing: 1948-11-19
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Granted: 1952-04-22
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Expires: 1968-11-19
Abstract
No abstract record available.
Inventors
- 👤 Allen G Eickmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:28
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
IN THE POLYMERIZATION OF FORMALDEHYDE TO PRODUCE PARAFORMALDEHYDE, THE IMPROVEMENT WHICH CONSISTS OF INTRODUCING A RELATIVELY WARM STREAM CONTAINING FORMALDEHYDE GAS INTO A RELATIVELY COOL SLURRY OF SOLID PARAFORMALDEHYDE PARTICLES SUSPENDED IN A FORMALDEHYDE-ABSORBENT LIQUID, THUS PRODUCING DESIRED LARGER PARTICLES OF PARAFORMALDEHYDE WHICH ARE READILY SEPARABLE FROM SAID LIQUID.
Claim 2
Dependent Claim
49 words
IN THE POLYMERIZATION OF FORMALDEHYDE TO PRODUCE PARAFORMALDEHYDE, THE IMPROVEMENT WHICH CONSISTS OF INTRODUCING A RELATIVELY WARM STREAM CONTAINING FORMALDEHYDE GAS INTO A RELATIVELY COOL SLURRY OF SOLID PARAFORMALDEHYDE PARTICLES SUSPENDED IN A FORMALDEHYDE-ABSORBENT LIQUID, THUS PRODUCING DESIRED LARGER PARTICLES OF PARAFORMALDEHYDE WHICH ARE READILY SEPARABLE FROM SAID LIQUID.
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) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |