Patent US3500951A successfully refreshed from Google Patents.
US3500951A
Expired / Lapsed
US
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Acoustical interferometric sensing device
Assignee: Pitney Bowes Inc
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Filing: 1968-04-22
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Granted: 1970-03-17
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Expires: 1988-04-22
Abstract
No abstract record available.
Inventors
- 👤 Basil B Beeken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:13
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/06; G01B; G01B17/00; G01S15/04; G01S7/00; G01S7/52; G01S7/52003; G01V; G01V1/00; G01V1/001; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/218; Y10T137/2191; Y10T137/2196
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) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |