US3501952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic torsion pendulum
Assignee: Shell USA Inc
•
Filing: 1967-08-28
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Granted: 1970-03-24
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Expires: 1987-08-28
Abstract
No abstract record available.
Inventors
- 👤 William P Gergen
- 👤 John C Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:23
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N3/38; G01N2203/00; G01N2203/0014; G01N2203/0021; G01N2203/02; G01N2203/022; G01N2203/0222; G01N2203/0226
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) | 1973-03-23 | 1973-09-22 | 1974-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-23 | 1977-09-22 | 1978-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-23 | 1981-09-22 | 1982-03-24 | $7700.00 | Window Closed / Lapsed |