US2881154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylated thiourea-aldehyde resins and their preparation
Assignee: Wyeth Holdings LLC
•
Filing: 1955-03-18
•
Granted: 1959-04-07
•
Expires: 1975-03-18
Abstract
No abstract record available.
Inventors
- 👤 Polansky Raymond
- 👤 Herbes William Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:08
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08G12/42; C08G12/421; C08G12/422
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS WHICH COMPRISES REACTING AT A TEMPERATURE BETWEEN ABOUT 45 AND ABOUT 65* C. AND PH BETWEEN ABOUT 4.5 AND 5.6, A WATER-SOLUBLE ALIPHATIC MONOHYDRIC ALCOHOL CONTAINING FROM 1 TO 3 CARBON ATOMS AND A HYDROPHILIC THIOUREA-FORMALDEHYDE CONDENSATE, SAID ALCOHOL AND FORMALDEHYDE CONDSATE OF THIOUREA BEING REACTED IN RELATIVE PROPORTIONS OF AT LEAST ABOUT 0.4 MOLE OF ALCOHOL PER MOLE ON A MONOMERIC BASIS OF SAID FORMALDEHYDE CONDENSATE OF THIOUREA, HALTING THE REACTION AFTER A SUBSTANTIAL AMOUNT OF ALCOHOL HAS REACTED, SAID SUBSTANTIAL AMOUNT BEING AT LEAST ABOUT 0.1 MOLE OF ALCOHOL COMBINED PER MOLE OF THIOUREA-FORMALDEHYDE CONDENSATE PERSENT CALCULATED ON A MONOMERIC BASIS, AND BEFORE A SAMPLE OF THE REACTION MIXTURE HYDROPHOBES UPON DILUTION WITH 50 VOLUMES OF WATER AT 20* C.
Claim 2
Dependent Claim
124 words
A PROCESS WHICH COMPRISES REACTING AT A TEMPERATURE BETWEEN ABOUT 45 AND ABOUT 65* C. AND PH BETWEEN ABOUT 4.5 AND 5.6, A WATER-SOLUBLE ALIPHATIC MONOHYDRIC ALCOHOL CONTAINING FROM 1 TO 3 CARBON ATOMS AND A HYDROPHILIC THIOUREA-FORMALDEHYDE CONDENSATE, SAID ALCOHOL AND FORMALDEHYDE CONDSATE OF THIOUREA BEING REACTED IN RELATIVE PROPORTIONS OF AT LEAST ABOUT 0.4 MOLE OF ALCOHOL PER MOLE ON A MONOMERIC BASIS OF SAID FORMALDEHYDE CONDENSATE OF THIOUREA, HALTING THE REACTION AFTER A SUBSTANTIAL AMOUNT OF ALCOHOL HAS REACTED, SAID SUBSTANTIAL AMOUNT BEING AT LEAST ABOUT 0.1 MOLE OF ALCOHOL COMBINED PER MOLE OF THIOUREA-FORMALDEHYDE CONDENSATE PERSENT CALCULATED ON A MONOMERIC BASIS, AND BEFORE A SAMPLE OF THE REACTION MIXTURE HYDROPHOBES UPON DILUTION WITH 50 VOLUMES OF WATER AT 20* C.
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) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |