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Patent US1777970A successfully refreshed from Google Patents.
US1777970A
Expired / Lapsed
US
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Cellulose ethers and process of making
Assignee: FIRM OF SOCIETY OF CHEMICAL INDUSTRY IN BASLE
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Filing: 1929-08-08
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Granted: 1930-10-07
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Expires: 1949-08-08
Abstract
No abstract record available.
Inventors
- 👤 Hartmann Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:27
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/325; D06M13/328; D06M13/33; C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/14; C08B11/145
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) | 1933-10-06 | 1934-04-07 | 1934-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-10-06 | 1938-04-07 | 1938-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-10-06 | 1942-04-07 | 1942-10-07 | $7700.00 | Window Closed / Lapsed |