US3371726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic apparatus
Assignee: Cooper Industries LLC
•
Filing: 1965-05-24
•
Granted: 1968-03-05
•
Expires: 1985-05-24
Abstract
No abstract record available.
Inventors
- 👤 John V Bouyoucos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:13
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/022; E21B6/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1195478A
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US1857624A
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US1942690A
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US2742265A
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US2893692A
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US2911192A
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US3004389A
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US3213615A
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US3154153A
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US3133472A
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US3262507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |