US2707755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High absorption backings for ultrasonic crystals
Assignee: Sperry Products Inc
•
Filing: 1950-07-20
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Granted: 1955-05-03
•
Expires: 1970-07-20
Abstract
No abstract record available.
Inventors
- 👤 Fred H Hardie
- 👤 Robert C Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:47
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
MEANS FOR DAMPING THE VIBRATION OF A PIEZO-ELECTRIC CRYSTAL, COMPRISING A BACKING MEMBER IN ENGAGEMENT WITH A VIBRATING SURFACE OF THE CRYSTAL, SAID MEMEBR HAVING A CONTINUOUSLY VARYING COMPOSITION TO YIELD VARYING ACOUSTIC IMPEDANCE FROM THE SURFACE OF THE CRYSTAL OUTWARDLY, THE ACOUSTIC IMPEDANCE OF THE COMPOSITION DIMINSHING AS THE DISTANCE FROM THE CRYSTAL INCREASES.
Claim 2
Dependent Claim
55 words
MEANS FOR DAMPING THE VIBRATION OF A PIEZO-ELECTRIC CRYSTAL, COMPRISING A BACKING MEMBER IN ENGAGEMENT WITH A VIBRATING SURFACE OF THE CRYSTAL, SAID MEMEBR HAVING A CONTINUOUSLY VARYING COMPOSITION TO YIELD VARYING ACOUSTIC IMPEDANCE FROM THE SURFACE OF THE CRYSTAL OUTWARDLY, THE ACOUSTIC IMPEDANCE OF THE COMPOSITION DIMINSHING AS THE DISTANCE FROM THE CRYSTAL INCREASES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-02 | 1958-11-01 | 1959-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-02 | 1962-11-01 | 1963-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-02 | 1966-11-01 | 1967-05-03 | $7700.00 | Window Closed / Lapsed |