US1213796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of compressing, purifying, drying, and cooling gases.
Assignee: PETROLEUM PRODUCTS Co
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Filing: 1916-05-05
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Granted: 1917-01-23
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Expires: 1936-05-05
Abstract
No abstract record available.
Inventors
- 👤 Willard Oliver Felt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:04
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493
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) | 1920-01-23 | 1920-07-24 | 1921-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-01-23 | 1924-07-24 | 1925-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-01-23 | 1928-07-24 | 1929-01-23 | $7700.00 | Window Closed / Lapsed |