US1704649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation and liquefaction of gases
Assignee: Individual
•
Filing: 1927-08-09
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Granted: 1929-03-05
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Expires: 1947-08-09
Abstract
No abstract record available.
Inventors
- 👤 Bowen William Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:12
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0243; F25J1/0257; F25J1/0269; F25J1/0271; F25J1/0272; F25J1/0002; F25J1/0022; F25J1/003; F25J1/0032; F25J1/0035; F25J1/004; F25J1/0042; F25J1/0045; F25J1/0201; F25J2220/00; F25J2220/60; F25J2220/62; F25J2220/64; F25J2220/66
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) | 1932-03-04 | 1932-09-03 | 1933-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-03-04 | 1936-09-03 | 1937-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-03-04 | 1940-09-03 | 1941-03-05 | $7700.00 | Window Closed / Lapsed |