US4640719B1
Expired / Lapsed
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US4640719B1 - - Google Patents
Assignee: Petroferm Inc
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Filing: 1985-07-01
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Granted: 1993-04-27
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Expires: 2005-07-01
Abstract
No abstract record available.
Inventors
- 👤 E Hayes Michael
- 👤 C Hood Craig
- 👤 E Miller Ronald
- 👤 Sharpe Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:50
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/024; C09; C09D; C09D9/00; H; H05; H05K; H05K3/00; H05K3/22; H05K3/26; H05K3/28; H05K3/288; H05K2203/00; H05K2203/07; H05K2203/0756; H05K2203/0769; H05K2203/0779; H05K2203/0783; H05K2203/16; H05K2203/162; H05K3/30; H05K3/32; H05K3/34; H05K3/3452
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) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |