US3523897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increased base number metal petroleum sulfonate and process for its preparation
Assignee: Phillips Petroleum Co
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Filing: 1966-04-05
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Granted: 1970-08-11
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Expires: 1986-04-05
Abstract
No abstract record available.
Inventors
- 👤 Albert N De Vault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:38
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165; C10; C10M; C10M159/00; C10M159/12; C10M159/20; C10M159/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |