US3019853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of gases by diffusion
Assignee: AT&T Inc
•
Filing: 1958-06-30
•
Granted: 1962-02-06
•
Expires: 1978-06-30
Abstract
No abstract record available.
Inventors
- 👤 Girard T Kohman
- 👤 Jr Kenneth B Mcafee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:16
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22; B01D63/00; B01D63/06; C; C01; C01B; C01B23/00; B01D2313/00; B01D2313/22; B01D2319/00; B01D2319/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
THE METHOD OF EXTRACTING HELIUM FROM A MIXTURE WITH OTHER GASES COMPRISING IMPRESSING THE MIXTURE UNDER A PRESSURE OF SEVERAL THOUSAND POUNDS PER SQUARE INCH UPON THE OUTER SURFACES OF A PLURALITY OF CAPILLARY TUBES
Claim 2
Independent Claim
35 words
THE METHOD OF EXTRACTING HELIUM FROM A MIXTURE WITH OTHER GASES COMPRISING IMPRESSING THE MIXTURE UNDER A PRESSURE OF SEVERAL THOUSAND POUNDS PER SQUARE INCH UPON THE OUTER SURFACES OF A PLURALITY OF CAPILLARY TUBES
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) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |