US3348902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system for projection magnifier
Assignee: Bausch and Lomb Inc
•
Filing: 1964-03-24
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Granted: 1967-10-24
•
Expires: 1984-03-24
Abstract
No abstract record available.
Inventors
- 👤 Ralph K Dakin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:47
CPC Classifications
G; G02; G02B; G02B1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A PROJECTION LENS SYSTEM FOR MAGNIFYING THE SIZE OF A PROJECTED IMAGE COMPRISING FOUR LENS ELEMENTS COMBINED INTO TWO COMPOUND COMPONENTS WHICH HAVE THE FOLLOWING CONSTRUCTIONAL DATA:
Claim 2
Dependent Claim
27 words
A PROJECTION LENS SYSTEM FOR MAGNIFYING THE SIZE OF A PROJECTED IMAGE COMPRISING FOUR LENS ELEMENTS COMBINED INTO TWO COMPOUND COMPONENTS WHICH HAVE THE FOLLOWING CONSTRUCTIONAL DATA:
References Cited (Backward Citations)
US873898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |