US2446937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Echo sounding indicator
Assignee: International Projector Corp
•
Filing: 1945-03-10
•
Granted: 1948-08-10
•
Expires: 1965-03-10
Abstract
No abstract record available.
Inventors
- 👤 George T Lorance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:51
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/06; G01S15/08; G01S15/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB230013A
Cited
US2033160A
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GB355705A
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US2131993A
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US2012837A
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US2105537A
Cited
GB497147A
Cited
US2250708A
Cited
US2287174A
Cited
US2346093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-10 | 1952-02-09 | 1952-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-10 | 1956-02-09 | 1956-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-10 | 1960-02-09 | 1960-08-10 | $7700.00 | Window Closed / Lapsed |