US3491333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse sonar navigational system
Assignee: Marquardt Corp
•
Filing: 1968-06-14
•
Granted: 1970-01-20
•
Expires: 1988-06-14
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Goulet
- 👤 Irving A Sofen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:29
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/50; G01S15/58; G01S15/60; G01S15/582; G01S7/00; G01S7/52; G01S7/523; G01S7/526; G01S7/529; Y; Y10; Y10S; Y10S367/00; Y10S367/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3028578A
Cited
US3009143A
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US3257638A
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US3223965A
Cited
US3234548A
Cited
US3217323A
Cited
US3295127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |