Patent US711947A successfully refreshed from Google Patents.
US1331784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammonia-saturator
Assignee: American Coke & Chemical Co
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Filing: 1915-04-17
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Granted: 1920-02-24
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Expires: 1935-04-17
Abstract
No abstract record available.
Inventors
- 👤 Roberts Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:25
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/12
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) | 1923-02-23 | 1923-08-25 | 1924-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-02-23 | 1927-08-25 | 1928-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-02-23 | 1931-08-25 | 1932-02-24 | $7700.00 | Window Closed / Lapsed |