Patent US2767698A successfully refreshed from Google Patents.
Patent US2347731A successfully refreshed from Google Patents.
US2347731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas purifier
Assignee: Individual
•
Filing: 1942-07-03
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Granted: 1944-05-02
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Expires: 1962-07-03
Abstract
No abstract record available.
Inventors
- 👤 Boivie Jean Ivan Ragnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:31
CPC Classifications
H; H01; H01G; H01G2/00; H01G2/12; B; B04; B04C; B04C5/00; B04C5/08; B04C5/081; B04C5/103; B04C5/14; B04C5/185; B04C5/187; C; C10; C10K; C10K1/00; C10K1/02
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) | 1947-05-02 | 1947-11-01 | 1948-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-05-02 | 1951-11-01 | 1952-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-05-02 | 1955-11-01 | 1956-05-02 | $7700.00 | Window Closed / Lapsed |