US2663713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hydantoin and glycine
Assignee: Dow Chemical Co
•
Filing: 1952-03-22
•
Granted: 1953-12-22
•
Expires: 1972-03-22
Abstract
No abstract record available.
Inventors
- 👤 Halbert C White
- 👤 Don V Wysong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:34
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; C07D233/74
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A PROCESS FOR MAKING HYDANTOIN WHICH COMPRISES INTRODUCING ONE MOLE OF FORMALDEHYDE INTO CONTACT WITH AN AQUEOUS SOLUTION CONTAINING AN AMMONIUM CARBONATE AND AN A ALKALI METAL CYANIDE IN PROPORTIONS SUFFICIENT TO PROVIDE THE CHEMICAL EQUIVALENT OF AT LEAST 2 MOLES OF AMMONIA, AT LEAST 1.5 MOLES OF CARBONATE AND AT LEAST ONE MOLE OF THE ALKALI METAL CYANIDE, AT TEMPERATURE BETWEEN -10* AND 30* C., AND AT A RATE SUCH THAT NOT MORE THAN ONE MOLE OF THE FORMALDEHYDE IS RELEASED TO THE REACTION OVER A PERIOD OF 4 HOURS, THEN HEATING THE SOLUTION TO A REACTION TEMPERATURE BETWEEN 50* AND 120* C. TO COMPLETE THE REACTION AND SEPARATING HYDANTOIN FROM THE REACTION LIQUID.
Claim 2
Dependent Claim
115 words
A PROCESS FOR MAKING HYDANTOIN WHICH COMPRISES INTRODUCING ONE MOLE OF FORMALDEHYDE INTO CONTACT WITH AN AQUEOUS SOLUTION CONTAINING AN AMMONIUM CARBONATE AND AN A ALKALI METAL CYANIDE IN PROPORTIONS SUFFICIENT TO PROVIDE THE CHEMICAL EQUIVALENT OF AT LEAST 2 MOLES OF AMMONIA, AT LEAST 1.5 MOLES OF CARBONATE AND AT LEAST ONE MOLE OF THE ALKALI METAL CYANIDE, AT TEMPERATURE BETWEEN -10* AND 30* C., AND AT A RATE SUCH THAT NOT MORE THAN ONE MOLE OF THE FORMALDEHYDE IS RELEASED TO THE REACTION OVER A PERIOD OF 4 HOURS, THEN HEATING THE SOLUTION TO A REACTION TEMPERATURE BETWEEN 50* AND 120* C. TO COMPLETE THE REACTION AND SEPARATING HYDANTOIN FROM THE REACTION LIQUID.
Claim 3
Dependent Claim
109 words
IN A PROCESS FOR MAKING HYDANTOIN, THE STEPS WHICH CONSIST IN INTRODUCING ONE MOLE OF FORMALDEHYDE INTO CONTACT WITH AN AQUEOUS SOLUTION CONTAINING AN AMMONIUM CARBONATE AND AN ALKALI METAL CYANIDE IN PROPORTIONS SUFFICIENT TO PROVIDE THE CHEMICAL EQUIVALENT OF AT LEAST 2 MOLES OF AMMONIA, AT LEAST 1.5 MOLES OF CARBONATE AND AT LEAST ONE MOLE OF THE ALKALI METAL CYANIDE, ATTEMPERATURES BETWEEN -10* AND 30* C., AND ATA RATE SUCH THAT NOT MORE THAN ONE MOLE OF THE FORMALDEHYDE IS RELEASED TO THE REACTION OVER A PERIOD OF 4 HOURS, THEN HEATING THE SOLUTION TO A REACTION TEMPERATURE BETWEEN 50* AND 120* C. TO COMPLETE THE REACTION.
Claim 4
Dependent Claim
109 words
IN A PROCESS FOR MAKING HYDANTOIN, THE STEPS WHICH CONSIST IN INTRODUCING ONE MOLE OF FORMALDEHYDE INTO CONTACT WITH AN AQUEOUS SOLUTION CONTAINING AN AMMONIUM CARBONATE AND AN ALKALI METAL CYANIDE IN PROPORTIONS SUFFICIENT TO PROVIDE THE CHEMICAL EQUIVALENT OF AT LEAST 2 MOLES OF AMMONIA, AT LEAST 1.5 MOLES OF CARBONATE AND AT LEAST ONE MOLE OF THE ALKALI METAL CYANIDE, ATTEMPERATURES BETWEEN -10* AND 30* C., AND ATA RATE SUCH THAT NOT MORE THAN ONE MOLE OF THE FORMALDEHYDE IS RELEASED TO THE REACTION OVER A PERIOD OF 4 HOURS, THEN HEATING THE SOLUTION TO A REACTION TEMPERATURE BETWEEN 50* AND 120* C. TO COMPLETE THE REACTION.
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) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |