US4055494B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
US4055494B1 - - Google Patents
Assignee: Baker Hughes Holdings LLC
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Filing: 1977-02-14
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Granted: 1987-02-10
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Expires: 1997-02-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:38
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/24; B01D21/2427; B01D21/0018; B01D21/0039; B01D21/0045; B01D21/02; B01D21/04; B01D21/06; B01D21/08; B01D21/30; B01D21/34; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281; C02F1/68; C02F1/685; C02F1/686
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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |