US3524702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for objectively and automatically refracting the eye
Assignee: Individual
•
Filing: 1968-09-06
•
Granted: 1970-08-18
•
Expires: 1988-09-06
Abstract
No abstract record available.
Inventors
- 👤 John G Bellows
- 👤 Howard C Borough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:29
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/103; A61B3/1035; G; G01; G01M; G01M11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1116529A
Cited
US2095235A
Cited
US2968994A
Cited
US3136839A
Cited
GB893990A
Cited
US3068745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |