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US3416668A
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US
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Assignee: D & S Engineering Internat Ltd
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Filing: 1967-08-23
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Granted: 1968-12-17
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Expires: 1987-08-23
Abstract
No abstract record available.
Inventors
- 👤 Lobley Derek Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:47
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/02; D21C9/06; B; B01; B01D; B01D33/00; B01D33/15; B01D33/17; B01D33/44; B01D33/46; B01D33/463; B01D33/466
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) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |