Patent US3485687A successfully refreshed from Google Patents.
US1502379A
Expired / Lapsed
US
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Manufacture of cellulose derivatives
Assignee: Henry Dreyfuss Associates LLC
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Filing: 1921-04-25
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Granted: 1924-07-22
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Expires: 1941-04-25
Abstract
No abstract record available.
Inventors
- 👤 Dreyfus Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:47
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04
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) | 1927-07-22 | 1928-01-21 | 1928-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-07-22 | 1932-01-21 | 1932-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-07-22 | 1936-01-21 | 1936-07-22 | $7700.00 | Window Closed / Lapsed |