US3305294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-element variable-power spherical lens
Assignee: Optical Research and Development Corp
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Filing: 1964-12-03
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Granted: 1967-02-21
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Expires: 1984-12-03
Abstract
No abstract record available.
Inventors
- 👤 Luis W Alvarez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:43
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/0081; G02C; G02C7/00; G02C7/02; G02C7/08; G02C7/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A VARIABLE-POWER LENS COMPRISING TWO LENS ELEMENTS ARRANGED IN TANDEM, ONE BEHIND THE OTHER ALONG THE OPTICAL AXIS OF THE LENS, AND MEANS FOR MOVING AT LEAST ONE OF SAID ELEMENTS RELATIVE TO THE OTHER IN A DIRECTION TRANSVERSE TO THE OPTICAL AXIS OF THE LENS, EACH OF SAID ELEMENTS HAVING POLISHED SURFACES WITH ONE OF THE SURFACES BEING A REGULAR SURFACE OF REVOLUTION AND AN OPTICAL THICKNESS VARIATION PARALLEL TO THE OPTICAL AXIS LESS THAN ONE-HALF THE LENS DIAMETER, AND THE OPTICAL THICKNESS OF EACH ELEMENT BEING SUBSTANTIALLY DEFINED BY THE FORMULA
Claim 2
Dependent Claim
93 words
A VARIABLE-POWER LENS COMPRISING TWO LENS ELEMENTS ARRANGED IN TANDEM, ONE BEHIND THE OTHER ALONG THE OPTICAL AXIS OF THE LENS, AND MEANS FOR MOVING AT LEAST ONE OF SAID ELEMENTS RELATIVE TO THE OTHER IN A DIRECTION TRANSVERSE TO THE OPTICAL AXIS OF THE LENS, EACH OF SAID ELEMENTS HAVING POLISHED SURFACES WITH ONE OF THE SURFACES BEING A REGULAR SURFACE OF REVOLUTION AND AN OPTICAL THICKNESS VARIATION PARALLEL TO THE OPTICAL AXIS LESS THAN ONE-HALF THE LENS DIAMETER, AND THE OPTICAL THICKNESS OF EACH ELEMENT BEING SUBSTANTIALLY DEFINED BY THE FORMULA
References Cited (Backward Citations)
GB250268A
Cited
US2263509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |