US3179601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization initiators
Assignee: Dow Chemical Co
•
Filing: 1960-08-24
•
Granted: 1965-04-20
•
Expires: 1980-08-24
Abstract
No abstract record available.
Inventors
- 👤 Joseph T Kummer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:22
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
A METHOD OF MAKING AN ADDITION POLYMERIZATION INITIATOR COMPRISING THE STEPS OF CONDUCTING A GAS CONSISTING ESSENTIALLY OF AN INERT CARRIER GAS AND VAPORS OF A MEMBER OF THE GROUP CONSISTING OF TITANIUM TETRACHLORIDE, TITANIUM TETRABROMIDE, AND MIXTURES OF TITANIUM TETRACHLORIDE AND TITANIUM TETRABROMIDE INTO REACTIVE ADMIXTURE WITH VAPORS OF MAGNESIUM OVER A POOL OF MOLTEN MAGNESIUM IN A REACTION ZONE, CONDUCTING THE RESULTING VAPOROUS REACTION MIXTURE AND ENTRAINED REACTION PRODUCTS FROM THE REACTION ZONE INTO A COOLING AND PRECIPITATION ZONE, AND COLLECTING THEREFROM A PYROPHORIC PULVERULENT SOLID REACTION PRODUCT CONTAINING MAGNESIUM, TITANIUM AND HALOGEN SELECTED FROM THE GROUP CONSISTING OF CHLORINE, BROMINE AND MIXTURES OF CHLORINE AND BROMINE CORRESPONDING TO THE STARTING TITANIUM COMPOUND.
References Cited (Backward Citations)
US2205854A
Cited
GB757873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |