Patent US2736749A successfully refreshed from Google Patents.
US2736749A
Expired / Lapsed
US
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Dye-fixing agents
Assignee: Arnold Hoffman & Co Inc
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Filing: 1952-06-10
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Granted: 1956-02-28
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Expires: 1972-06-10
Abstract
No abstract record available.
Inventors
- 👤 Charles A Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:45
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/52; D06P1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS FOR THE PRODUCTION OF GUANIDINE-FORMALDEHYDE CONDENSATION PRODUCTS WHICH COMPRISES HEATING AN AQUEOUS REACTION MIXTURE OF GUANIDINE AND FORMALDEHYDE AT A TEMPERATURE BETWEEN ABOUT 20 AND 80* C. FOR A PERIOD OF TIME RANGING FROM UP TO FIFTEEN MINUTES AT 80* C. TO AT LEAST SIX HOURS AT 20* C. THE REACTON TIME VARYING INVERSELY WITH THE REACTION TEMPERATURE AND HAVING A MAXIMUM OF ABOUT 24 HOURS AT 20* C., SAID REACTION MIXTURE CONTAINING FROM 1.5 TO 3.5 MOLES OF FORMALDHYDE PER MOLE OF GUANIDINE AND TERMINATING SAID REACTION OF GUANIDINE AND FORMALDEHDE UPON THE EXPIRATION OF THE SAID REACTION TIME.
Claim 2
Dependent Claim
102 words
A PROCESS FOR THE PRODUCTION OF GUANIDINE-FORMALDEHYDE CONDENSATION PRODUCTS WHICH COMPRISES HEATING AN AQUEOUS REACTION MIXTURE OF GUANIDINE AND FORMALDEHYDE AT A TEMPERATURE BETWEEN ABOUT 20 AND 80* C. FOR A PERIOD OF TIME RANGING FROM UP TO FIFTEEN MINUTES AT 80* C. TO AT LEAST SIX HOURS AT 20* C. THE REACTON TIME VARYING INVERSELY WITH THE REACTION TEMPERATURE AND HAVING A MAXIMUM OF ABOUT 24 HOURS AT 20* C., SAID REACTION MIXTURE CONTAINING FROM 1.5 TO 3.5 MOLES OF FORMALDHYDE PER MOLE OF GUANIDINE AND TERMINATING SAID REACTION OF GUANIDINE AND FORMALDEHDE UPON THE EXPIRATION OF THE SAID REACTION TIME.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |