US3428387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction driven microscope stages
Assignee: W Watson and Sons Ltd
•
Filing: 1964-04-07
•
Granted: 1969-02-18
•
Expires: 1984-04-07
Abstract
No abstract record available.
Inventors
- 👤 Kenneth Frank Hall
- 👤 George Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:01
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/24; G02B21/26; G02B21/241; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49696
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2731879A
Cited
US1891052A
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US2325239A
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US2473896A
Cited
US2681592A
Cited
US2792711A
Cited
US3272568A
Cited
US3204584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |