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Patent US3531187A successfully refreshed from Google Patents.
US3531187A
Expired / Lapsed
US
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Eye test frame support
Assignee: Individual
•
Filing: 1968-08-27
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Granted: 1970-09-29
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Expires: 1988-08-27
Abstract
No abstract record available.
Inventors
- 👤 William H Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:43
CPC Classifications
G; G02; G02C; G02C3/00; G02C3/003; A; A61; A61B; A61B3/00; A61B3/02; A61B3/028; A61B3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US916109A
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US1328669A
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US2526582A
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US2504524A
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US2659266A
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US2635239A
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US2757574A
Cited
US2848924A
Cited
US3009235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |