US4159682B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
US4159682B1 - - Google Patents
Assignee: Dorr Oliver Inc
•
Filing: 1977-12-01
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Granted: 1986-09-16
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Expires: 1997-12-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:29
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; B01J8/28; B01J8/32; C; C02; C02F; C02F11/00; C02F11/06; C02F11/12; C02F11/13; F; F23; F23G; F23G5/00; F23G5/30; F23G2201/00; F23G2201/10; F23G2203/00; F23G2203/50; F23G2203/503; F23G2206/00; F23G2206/10; F23G2209/00; F23G2209/12; Y; Y02; Y02W; Y02W10/00; Y02W10/40
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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |