US2602047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of concentrating isotopic carbon
Assignee: Individual
•
Filing: 1949-12-21
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Granted: 1952-07-01
•
Expires: 1969-12-21
Abstract
No abstract record available.
Inventors
- 👤 Calvin Melvin
- 👤 John W Weigl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:24
CPC Classifications
B; B01; B01D; B01D59/00; B01D59/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
46 words
THE PROCESS OF ENRICHING CARBON DIOXIDE WITH RESPECT TO THE HEAVY ISOTOPES OF CARBON CONTAINED THEREIN COMPRISING CONTACTING SAID CARBON DIOXIDE WHILE PRESENT TO THE EXTENT OF 0.5 TO 10 VOLUME PERCENT IN ADMIXTURE WITH AN INERT GAS WITH CHLOROPHYLIC PLANT LIFE IN A CLOSED SYSTEM.
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) | 1955-07-01 | 1955-12-31 | 1956-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-01 | 1959-12-31 | 1960-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-01 | 1963-12-31 | 1964-07-01 | $7700.00 | Window Closed / Lapsed |