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US2857802A
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Displacement measuring device using the light pattern from optical gratings
Assignee: EMI Ltd
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Filing: 1955-08-22
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Granted: 1958-10-28
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Expires: 1975-08-22
Abstract
No abstract record available.
Inventors
- 👤 Cail Roland Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:35
CPC Classifications
G; G01; G01B; G01B21/00; G01B21/02; G01B21/06; G01B21/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1415627A
Cited
US2656106A
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US2462292A
Cited
US2479802A
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US2604004A
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US2596752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |