US3520615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical phase measuring apparatus
Assignee: Vickers Ltd
•
Filing: 1965-10-25
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Granted: 1970-07-14
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Expires: 1985-10-25
Abstract
No abstract record available.
Inventors
- 👤 Francis Hughes Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
G; G01; G01J; G01J9/00; G01J9/02; G01B; G01B9/00; G01B9/02; G01B9/02001; G01B9/02011; G01B9/04; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/14; G02B26/00; G02B26/06; G01B2290/00; G01B2290/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3041921A
Cited
US3134840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |