US2622858A
Expired / Lapsed
US
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Apparatus for submerged gas diffusion
Assignee: Infilco Inc
•
Filing: 1948-04-22
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Granted: 1952-12-23
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Expires: 1968-04-22
Abstract
No abstract record available.
Inventors
- 👤 Walter J Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:19
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; C02F3/205; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/233; B01F23/2334; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US864811A
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US901450A
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US1242445A
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US1936308A
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US2126164A
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US2393976A
Cited
US2447123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |