Patent US119464A successfully refreshed from Google Patents.
Patent US2037809A successfully refreshed from Google Patents.
US2037809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical manufacture
Assignee: Mathieson Alkali Works Inc
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Filing: 1934-01-06
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Granted: 1936-04-21
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Expires: 1954-01-06
Abstract
No abstract record available.
Inventors
- 👤 Robert B Macmullin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:09
CPC Classifications
C; C04; C04B; C04B2/00; C04B2/10; C04B2/12; B; B01; B01J; B01J8/00; B01J8/08; B01J8/12; F; F27; F27B; F27B1/00; F27B1/08; Y; Y02; Y02P; Y02P40/00; Y02P40/40
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) | 1939-04-21 | 1939-10-21 | 1940-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-04-21 | 1943-10-21 | 1944-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-04-21 | 1947-10-21 | 1948-04-21 | $7700.00 | Window Closed / Lapsed |