Patent US2879157A successfully refreshed from Google Patents.
US2879157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of alkali metals by heat transfer
Assignee: MSA Safety Inc
•
Filing: 1955-10-04
•
Granted: 1959-03-24
•
Expires: 1975-10-04
Abstract
No abstract record available.
Inventors
- 👤 Edward F Batutis
- 👤 Shelby L Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:26
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/02; C22B26/00; C22B26/10; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |