US2634969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuous recovery of magnesium
Assignee: NORTH CAROLINA MAGNESIUM DEV C
•
Filing: 1950-04-24
•
Granted: 1953-04-14
•
Expires: 1970-04-24
Abstract
No abstract record available.
Inventors
- 👤 Hansgirg Josefine Maria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:59
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B26/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
IN AN APPARATUS OF THE CLASS DESCRIBED, A RETORT CHAMBER, A TUBULAR RETORT DISPOSED IN SAID CHAMBER WITH ITS WALLS SPACED FROM THE WALLS OF THE CHAMBER, MEANS FOR CHARGING MATERIAL INTO AND DISCHARGING IT FROM SAID RETORT, SAID RETORT BEING IN THE FORM OF A SUBSTANTIALLY CYLINGRICAL CAGE AND COMPRISING A COMPLETELY ANNULAR SERIES OF PARALLEL VERTICAL RODS, SAID RODS BEING OF ELECTRICALLY RESISTANT MATERIAL AND BEING SPACED APART A SLIGHT DISTANCE TO PROVIDE OPENINGS THROUGH WHICH SAID RAW MATERIAL MAY NOT PASS BUT THROUGH WHICH VAPORS EVOLVED FROMT HE MATERIAL MAY PASS TO THE SPACE BETWEEN THE WALLS OF SAID
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |