US1530461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of helium
Assignee: Gas Equipment Engineering Corp
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Filing: 1922-09-25
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Granted: 1925-03-17
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Expires: 1942-09-25
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:59
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/06; F25J3/063; F25J3/0685; F25J3/069; F25J3/0605; F25J3/061; F25J3/0635; F25J3/066; F25J2215/00; F25J2215/30; F25J2270/00; F25J2270/40; F25J2270/42
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) | 1928-03-16 | 1928-09-15 | 1929-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-03-16 | 1932-09-15 | 1933-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-03-16 | 1936-09-15 | 1937-03-17 | $7700.00 | Window Closed / Lapsed |