Patent US4132420A successfully refreshed from Google Patents.
Patent US3580663A successfully refreshed from Google Patents.
US3580663A
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US
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Composite lenses
Assignee: ZF International UK Ltd
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Filing: 1968-09-10
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Granted: 1971-05-25
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Expires: 1988-09-10
Abstract
Abstract A lens of large diameter and short focal length comprises a plurality of interengageable elements which are moulded in a transparent material, or in transparent materials having the same refractive index. The elements are interengaged to constitute the required lens.
Inventors
- 👤 Harris Vernon Hicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:49
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/02; G02B3/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
An improved composite lens of short focal length and large diameter comprising a plurality of interengageable elements moulded in a transparent material, or in transparent materials having the same refractive index, the elements being interengaged to constitute the required lens, and axially extending location means integral with one of said interengageable elements and engageable with the other elements to locate Said other element in the desired position with respect to said one element, said means comprising a rod integral with one of said outer elements of the outer elements of the lens and extending through the remaining elements.
Claim 2
Dependent Claim
98 words
An improved composite lens of short focal length and large diameter comprising a plurality of interengageable elements moulded in a transparent material, or in transparent materials having the same refractive index, the elements being interengaged to constitute the required lens, and axially extending location means integral with one of said interengageable elements and engageable with the other elements to locate Said other element in the desired position with respect to said one element, said means comprising a rod integral with one of said outer elements of the outer elements of the lens and extending through the remaining elements.
Claim 3
Dependent Claim
36 words
A lens as claimed in claim 1 wherein the mating surfaces of the elements are coated with a substance which eliminates air gaps between said mating surfaces without materially affecting the optical properties of the lens.
Claim 4
Dependent Claim
23 words
A lens as claimed in claim 1 wherein one of the outer surfaces of the lens is shaped to render the lens aspherical.
Claim 5
Dependent Claim
22 words
An achromatic lens combination utilizing a lens as claimed in claim 1 as one of the outer elements of the lens combination.
Claim 6
Dependent Claim
20 words
A lens combination as claimed in claim 4 wherein the other outer element is constituted by a moulded echelon lens.
Claim 7
Dependent Claim
23 words
An achromatic lens combination utilizing a pair of lenses as claimed in claim 1 as the two outer elements of the lens combination.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |