US3408822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diving method and apparatus
Assignee: Shell USA Inc
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Filing: 1966-08-05
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Granted: 1968-11-05
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Expires: 1986-08-05
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Chate
- 👤 Steven A T Kapteyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:13
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/34; B63C11/36; B63C11/40; E; E21; E21B; E21B29/00; E21B29/04; E21B33/00; E21B33/02; E21B33/03; E21B33/068; E21B33/076; E21B41/00; E21B41/06
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) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |