Patent US5438649A successfully refreshed from Google Patents.
Patent US2792117A successfully refreshed from Google Patents.
US2792117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
laboon
Assignee: —
•
Filing: —
•
Granted: 1957-05-14
•
Expires: 1974-05-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:23
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/78; B; B01; B01D; B01D21/00; B01D21/0012; B01D21/003; B01D21/0039; B01D21/009; B01D21/10; B01D21/24; B01D21/2427; B01D21/2433; B01D21/2444; B01D21/245; C02F2001/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1990458A
Cited
US2094909A
Cited
US2190598A
Cited
US2196991A
Cited
US2246224A
Cited
US2360811A
Cited
US2528649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-13 | 1960-11-12 | 1961-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-13 | 1964-11-12 | 1965-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-13 | 1968-11-12 | 1969-05-14 | $7700.00 | Window Closed / Lapsed |