Patent US3171884A successfully refreshed from Google Patents.
US3171884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnifier having a relatively large field and eye relief
Assignee: Council On Library Resources Inc
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Filing: 1960-04-11
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Granted: 1965-03-02
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Expires: 1980-04-11
Abstract
No abstract record available.
Inventors
- 👤 John R Miles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:04
CPC Classifications
G; G02; G02B; G02B25/00; G02B25/002; G02B25/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A MAGNIFIER HAVING AT LEAST FIVE LENS ELEMENTS IN WHICH THE CONSTRUCTIONAL DATA OF THE LENS ELEMENTS ARE AS FOLLOWS:
Claim 2
Dependent Claim
20 words
A MAGNIFIER HAVING AT LEAST FIVE LENS ELEMENTS IN WHICH THE CONSTRUCTIONAL DATA OF THE LENS ELEMENTS ARE AS FOLLOWS:
References Cited (Backward Citations)
US435271A
Cited
US1759529A
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US1707351A
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US1929199A
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US2719457A
Cited
US2861499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |