US3417152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of stabilizing trichloroethylene
Assignee: Montedison SpA
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Filing: 1966-05-31
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Granted: 1968-12-17
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Expires: 1986-05-31
Abstract
No abstract record available.
Inventors
- 👤 Germano Patron
- 👤 Ottavio Merluzzi
- 👤 Antonio Ferri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:23
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A METHOD OF STABLIZING TRICHLOROETHYLENE CONTAINING HYDROGEN, CHLORIDE, AND PHOSGENE, COMPRISING THE STEPS OF ADIMIXING THYMOL IN AN AMOUNT RANGING BETWEEN SUBSTANTIALLY 0.001% AND 0.01% BY WEIGHT OF THE TRICHLOROETHYLENE, OR P-TERTIARYAMYL PHENOL IN AN AMOUNT RANGING BETWEEN SUBSTANTIALLY 0.01 AND 0.001% BY WEIGHT OF THE TRICHLOROETHYLENE, OR HYDROQUINONE MONOMETHYL ETHER PREENT IN AN AMOUNT RANGING BETWEEN SUBSTANTIALLY 0.001 AND 0.1% BY WEIGHT OF THE TRICHLOROETHYLENE WITH AT LEAST ONE EPOXIDE SELECTED FROM THE GROUP CONSISTING OF PROPYLENE OXIDE AND BUTYLENE OXIDE, SAID EPOXIDE BEING PRESENT IN AN AMOUNT RANGING BETWEEN SUBSTANTIALLY 0.05% AND 0.3% BY WEIGHT OF THE TRICHLOROETHYLENE; DISPERSING THE RESULTING MIXTURE IN SAID TRICHLOROETHYLENE BY REPEATEDLY PUMPING THE TRICHLOROETHYLENE WITH SAID MIXTURE ADDED THERETO ALONG A RECYCLING PATH; ADDING GASEOUS AMMONIA TO THE RESULTING COMPOSITION AND PRECIPITATING THEREFROM AMMONIA SALTS WHILE NEUTRALIZING ACIDITY OF THE COMPOSITION; ADDING TO SAID COMPOSITION BETWEEN SUBSTANTIALLY 0.001% AND 1% BY WEIGHT OF THE TRICHLOROETHYLENE OF FORMALDEHYDE DIMETHYLHYDRAZONE HAVING THE FORMULA
Claim 2
Independent Claim
159 words
A METHOD OF STABLIZING TRICHLOROETHYLENE CONTAINING HYDROGEN, CHLORIDE, AND PHOSGENE, COMPRISING THE STEPS OF ADIMIXING THYMOL IN AN AMOUNT RANGING BETWEEN SUBSTANTIALLY 0.001% AND 0.01% BY WEIGHT OF THE TRICHLOROETHYLENE, OR P-TERTIARYAMYL PHENOL IN AN AMOUNT RANGING BETWEEN SUBSTANTIALLY 0.01 AND 0.001% BY WEIGHT OF THE TRICHLOROETHYLENE, OR HYDROQUINONE MONOMETHYL ETHER PREENT IN AN AMOUNT RANGING BETWEEN SUBSTANTIALLY 0.001 AND 0.1% BY WEIGHT OF THE TRICHLOROETHYLENE WITH AT LEAST ONE EPOXIDE SELECTED FROM THE GROUP CONSISTING OF PROPYLENE OXIDE AND BUTYLENE OXIDE, SAID EPOXIDE BEING PRESENT IN AN AMOUNT RANGING BETWEEN SUBSTANTIALLY 0.05% AND 0.3% BY WEIGHT OF THE TRICHLOROETHYLENE; DISPERSING THE RESULTING MIXTURE IN SAID TRICHLOROETHYLENE BY REPEATEDLY PUMPING THE TRICHLOROETHYLENE WITH SAID MIXTURE ADDED THERETO ALONG A RECYCLING PATH; ADDING GASEOUS AMMONIA TO THE RESULTING COMPOSITION AND PRECIPITATING THEREFROM AMMONIA SALTS WHILE NEUTRALIZING ACIDITY OF THE COMPOSITION; ADDING TO SAID COMPOSITION BETWEEN SUBSTANTIALLY 0.001% AND 1% BY WEIGHT OF THE TRICHLOROETHYLENE OF FORMALDEHYDE DIMETHYLHYDRAZONE HAVING THE FORMULA
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) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |