US3408135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projective objective having three elements plus an integral right angle prism
Assignee: 3M Co
•
Filing: 1966-04-12
•
Granted: 1968-10-29
•
Expires: 1986-04-12
Abstract
No abstract record available.
Inventors
- 👤 Roger H Appeldorn
- 👤 David C Gilkeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:13
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A LENS SYSTEM CONSISTING ESSENTIALLY OF FOUR AIRSPACED LENS ELEMENTS, ONE OF SAID ELEMENTS BEING A TRIANGULAR PRISM INTEGRATED IN SAID SYSTEM FOR CHANGING THE DIRECTION OF THE OPTIC AXIS OF THE LENS SYSTEM, THE OTHER THREE OF SAID ELEMENTS BEING OPTICALLY ALIGNED ALONG SAID OPTIC AXIS, THE FIRST OF SAID THREE ELEMENTS BEING A BICONVEX LENS POSITIONED ADJACENT ONE SIDE OF THE PRISM, THE SECOND BEING A BICONCAVE LENS POSITIONED ADJACENT THE OTHER SIDE OF THE PRISM, AND THE THIRD BEING A BICONVEX LENS POSITIONED ADJACENT SAID BICONCAVE LENS AND MOVABLE ALONG THE OPTIC AXIS TO PROVIDE A VARIABLE SPACING FROM SAID BICONCAVE LENS, AND WHEREIN THE CHARACTERISTICS OF THE LENS ELEMENTS AND THEIR SPATIAL RELATIONSHIP ARE SUBSTANTIALLY AS IN THE FOLLOWING TABLE:
Claim 2
Dependent Claim
124 words
A LENS SYSTEM CONSISTING ESSENTIALLY OF FOUR AIRSPACED LENS ELEMENTS, ONE OF SAID ELEMENTS BEING A TRIANGULAR PRISM INTEGRATED IN SAID SYSTEM FOR CHANGING THE DIRECTION OF THE OPTIC AXIS OF THE LENS SYSTEM, THE OTHER THREE OF SAID ELEMENTS BEING OPTICALLY ALIGNED ALONG SAID OPTIC AXIS, THE FIRST OF SAID THREE ELEMENTS BEING A BICONVEX LENS POSITIONED ADJACENT ONE SIDE OF THE PRISM, THE SECOND BEING A BICONCAVE LENS POSITIONED ADJACENT THE OTHER SIDE OF THE PRISM, AND THE THIRD BEING A BICONVEX LENS POSITIONED ADJACENT SAID BICONCAVE LENS AND MOVABLE ALONG THE OPTIC AXIS TO PROVIDE A VARIABLE SPACING FROM SAID BICONCAVE LENS, AND WHEREIN THE CHARACTERISTICS OF THE LENS ELEMENTS AND THEIR SPATIAL RELATIONSHIP ARE SUBSTANTIALLY AS IN THE FOLLOWING TABLE:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |