US2838508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process and product
Assignee: Primerica Inc
•
Filing: 1956-09-18
•
Granted: 1958-06-10
•
Expires: 1976-09-18
Abstract
No abstract record available.
Inventors
- 👤 Hugh E Ramsden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:46
CPC Classifications
C; C07; C07F; C07F3/00; C07F3/02; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS FOR RELEASING CYCLIC ETHERS FROM THEIR COMPLEX WITH ORGANOMAGNESIUM CHLORIDE TYPE GRIGNARDS WITHOUT DESTRUCTION OF THE GRIGNARD AND WITHOUT RENDERING THE GRIGNARD UNAVAILABLE FOR SUBSEQUENT REACTION WHICH COMPRISES MIXING A COMPOSITION CONTAINING THE COMPLEX WITH AN ETHYLENE POLYETHER OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
44 words
A PROCESS FOR RELEASING CYCLIC ETHERS FROM THEIR COMPLEX WITH ORGANOMAGNESIUM CHLORIDE TYPE GRIGNARDS WITHOUT DESTRUCTION OF THE GRIGNARD AND WITHOUT RENDERING THE GRIGNARD UNAVAILABLE FOR SUBSEQUENT REACTION WHICH COMPRISES MIXING A COMPOSITION CONTAINING THE COMPLEX WITH AN ETHYLENE POLYETHER OF THE GENERAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |