Patent US1101821A successfully refreshed from Google Patents.
US2470737A
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Method and means of finishing piezoelectric crystals
Assignee: PREMIER CRYSTAL LAB Inc
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Filing: 1944-08-29
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Granted: 1949-05-17
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Expires: 1964-08-29
Abstract
No abstract record available.
Inventors
- 👤 Henry M Bach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:33
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; H03H3/04; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1848630A
Cited
DE445046C
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US1869160A
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US2123227A
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US2204763A
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US2320080A
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US2272994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-16 | 1952-11-15 | 1953-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-16 | 1956-11-15 | 1957-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-16 | 1960-11-15 | 1961-05-17 | $7700.00 | Window Closed / Lapsed |