Patent US3487220A successfully refreshed from Google Patents.
US3487220A
Expired / Lapsed
US
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Device for the detection and measurement of very small displacements by converting the said displacements into variable frequency oscillations
Assignee: LAB CENTRAL DES IND ELECTR
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Filing: 1967-07-03
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Granted: 1969-12-30
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Expires: 1987-07-03
Abstract
No abstract record available.
Inventors
- 👤 Francois Ch Buchy
- 👤 Philippe G Bauduin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:16
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01B; G01B11/00; G01B11/02; G01B7/00; G01B7/02
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) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |