Patent US2636019A successfully refreshed from Google Patents.
US2636019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange resins from a trifunctional phenol, formaldehyde and a mannich base made from a trifunctional phenol, formaldehyde and a dialkylamine, morpholine or piperidine
Assignee: Research Corp
•
Filing: 1951-06-26
•
Granted: 1953-04-21
•
Expires: 1971-06-26
Abstract
No abstract record available.
Inventors
- 👤 George B Butler
- 👤 Ben M Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:23
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
WATER INSOLUBLE QUATERNARY AMMONIUM RESINOUS CONDENSATION PRODUCTS OF A TRIFUNCTIONAL PHENOL, FORMALDEHYDE AND A MANNICH BASE RESULTING FROM THE REACTION OF A SECONDARY AMINE OF THE GROUP CONSISTING OF DIALKYLAMINES, MORPHOLINE AND PIPERIDINE, A TRIFUNCITONAL PHENOL AND FORMALDEHYDE.
Claim 2
Dependent Claim
38 words
WATER INSOLUBLE QUATERNARY AMMONIUM RESINOUS CONDENSATION PRODUCTS OF A TRIFUNCTIONAL PHENOL, FORMALDEHYDE AND A MANNICH BASE RESULTING FROM THE REACTION OF A SECONDARY AMINE OF THE GROUP CONSISTING OF DIALKYLAMINES, MORPHOLINE AND PIPERIDINE, A TRIFUNCITONAL PHENOL AND FORMALDEHYDE.
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) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |