US2729910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controllable depth maintaining devices
Assignee: Raytheon Co
•
Filing: 1950-04-26
•
Granted: 1956-01-10
•
Expires: 1970-04-26
Abstract
No abstract record available.
Inventors
- 👤 Robert A Fryklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:51
CPC Classifications
A; A01; A01K; A01K73/00; A01K73/02; A01K73/025; B; B63; B63B; B63B21/00; B63B21/56; B63B21/66; B63B21/663
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB339149A
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DE584673C
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FR43216E
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US2386950A
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US2470621A
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US2632150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |