US2536025A
Expired / Lapsed
US
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Piezoelectric interferometer system
Assignee: CRYSTAL RES LAB Inc
•
Filing: 1945-04-14
•
Granted: 1951-01-02
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Expires: 1965-04-14
Abstract
No abstract record available.
Inventors
- 👤 Richard K Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:31
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/22; G01K11/26; G01N; G01N29/00; G01N29/02; G05; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/013; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02881; Y; Y10; Y10S; Y10S73/00; Y10S73/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1858931A
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US2283750A
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US2378226A
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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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |