Patent US2548428A successfully refreshed from Google Patents.
US2548428A
Expired / Lapsed
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Preparation of quaternary amines from tertiary amines and betalactones
Assignee: Goodrich Corp
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Filing: 1949-05-06
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Granted: 1951-04-10
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Expires: 1969-05-06
Abstract
No abstract record available.
Inventors
- 👤 Fred T Fiedorek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:07
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/12; C07D487/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
THE METHOD WHICH COMPRISES BRINGING TOGETHER IN THE LIQUID PHASE REACTANTS CONSISTING OF A SATURATED ALIPHATIC BETA-LACTONE OF THE FORMULA
Claim 2
Independent Claim
20 words
THE METHOD WHICH COMPRISES BRINGING TOGETHER IN THE LIQUID PHASE REACTANTS CONSISTING OF A SATURATED ALIPHATIC BETA-LACTONE OF 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) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |