US2106486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
The production of anion-exchange resins from m-phenylenediamine
Assignee: ChampionX LLC
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Filing: 1936-12-03
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Granted: 1938-01-25
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Expires: 1956-12-03
Abstract
No abstract record available.
Inventors
- 👤 Willard H Kirkpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:35
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/06; C08G12/08; B; B01; B01J; B01J20/00; B01J20/22; B01J41/00; B01J41/08; B01J41/12; B01J41/13
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) | 1941-01-24 | 1941-07-26 | 1942-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-01-24 | 1945-07-26 | 1946-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-01-24 | 1949-07-26 | 1950-01-25 | $7700.00 | Window Closed / Lapsed |