Patent US2306440A successfully refreshed from Google Patents.
US2306440A
Expired / Lapsed
US
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Dissolving, softening, gelatinizing, and swelling agents
Assignee: "patchem A-G Zur Beteiligung An Patenten und Sonstigen Erfindungsrechten Auf Chemische Verfahren
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Filing: 1939-04-13
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Granted: 1942-12-29
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Expires: 1959-04-13
Abstract
No abstract record available.
Inventors
- 👤 Hentrich Winfrid
- 👤 Schirm Erik
- 👤 Endres Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:00
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3477; C08K5/3492; C08K5/34924
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) | 1945-12-28 | 1946-06-29 | 1946-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-12-28 | 1950-06-29 | 1950-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-12-28 | 1954-06-29 | 1954-12-29 | $7700.00 | Window Closed / Lapsed |