US3382170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing an oil film from water with silicone-coated expanded perlite
Assignee: Deutsche Perlite GmbH
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Filing: 1965-09-23
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Granted: 1968-05-07
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Expires: 1985-09-23
Abstract
No abstract record available.
Inventors
- 👤 Pape Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:35
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J20/106; C; C02; C02F; C02F1/00; C02F1/68; C02F1/681; C04; C04B; C04B20/00; C04B20/10; C04B20/1051; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/922; Y10S210/925
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) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |