US1664412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of helium from natural gas
Assignee: Linde Air Products Co
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Filing: 1919-08-07
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Granted: 1928-04-03
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Expires: 1939-08-07
Abstract
No abstract record available.
Inventors
- 👤 Pierre E Haynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:44
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/08; F25J3/02; F25J3/0204; F25J3/0209; F25J3/0228; F25J3/0233; F25J3/0257; F25J3/028; F25J3/029; F25J2200/00; F25J2200/02; F25J2200/08; F25J2215/00; F25J2215/30; F25J2270/00; F25J2270/12; F25J2270/42; F25J2270/90
Claims Analysis
Total Claims: 0
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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) | 1931-04-03 | 1931-10-03 | 1932-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-04-03 | 1935-10-03 | 1936-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-04-03 | 1939-10-03 | 1940-04-03 | $7700.00 | Window Closed / Lapsed |