Patent US2652386A successfully refreshed from Google Patents.
US2652386A
Expired / Lapsed
US
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Continuous preparation of beaded phenolsulfonic acid-formaldehyde condensation product
Assignee: Wyeth Holdings LLC
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Filing: 1949-02-17
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Granted: 1953-09-15
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Expires: 1969-02-17
Abstract
No abstract record available.
Inventors
- 👤 Wallman Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:45
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
IN A PROCESS FOR THE PREPARATION OF AN INSOLUBLE CURED PHENOL SULFONIC ACID-FORMALDEHYDE RESIN IN BEAD FORM THE STEPS WHICH COMPRISE CONTINUOUSLY MIXING TOGETHER PHENOL SULFONIC ACID AND AQUEOUS FORMALDEHYDE, IMMEDIATELY DISPERSING THE RESULTING MIXTURE IN AN INERT ORGANIC NONSOLVENT LIQUID CONTAINING A SURFACE ACTIVE AGENT, THE DENSITY OF SAID LIQUID BEING SUBSTANTIALLY EQUIVALENT TO THAT OF SAID MIXTURE AND LESS THAN THAT OF THE RESIN BEADS TO BE PRODUCED, CONTINUOUSLY PASSING THE SO-OBTAINED DROPLETS OF SAID MIXTURE THROUGH SAID LIQUID, CONTACT BETWEEN SAID DROPLETS AND SAID LIQUID BEING MAINTAINED AT LEAST UNTIL SAID MIXTURE HAS GELLED AND THE DROPLETS ARE CONSEQUENTLY SOLIDIFIED, AND CURING THE GELLED DROPLETS.
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) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |