Patent US4562900A successfully refreshed from Google Patents.
US4562900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens system for acoustic transducer array
Assignee: Varian Medical Systems Technologies Inc
•
Filing: 1984-12-20
•
Granted: 1986-01-07
•
Expires: 2004-12-20
Abstract
Abstract A lens system for directing and focussing acoustic energy from an array of acoustic transducers on a small target can be made lightweight, low in absorption and dispersion by incorporating plastic Fresnel lenses with prisms into a monolithic tray of the same plastic with one lens for each transducer.
Inventors
- 👤 Weston A. Anderson
- 👤 William G. Turnbull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:53
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
An acoustic energy delivery system, comprising: a multiplicity of acoustic transducers; means for exciting said transducers; and means for directing and focussing acoustic energy from said multiplicity of acoustic transducers onto a target, said means for directing and focussing including a monolithic tray of plastic incorporating a multiplicity of Fresnel lenses and prisms in portions thereof.
Claim 2
Dependent Claim
56 words
An acoustic energy delivery system, comprising: a multiplicity of acoustic transducers; means for exciting said transducers; and means for directing and focussing acoustic energy from said multiplicity of acoustic transducers onto a target, said means for directing and focussing including a monolithic tray of plastic incorporating a multiplicity of Fresnel lenses and prisms in portions thereof.
Claim 3
Dependent Claim
58 words
An acoustic energy delivery system as in claim 1 wherein the acoustic energy is transmitted from said multiplicity of acoustic transducers to the target through a liquid, wherein the plastic of said monolithic tray has speed of sound less than of said liquid, and wherein the portions of said monolithic tray having Fresnel lenses are plano-concave Fresnel lenses.
Claim 4
Dependent Claim
97 words
An improvement in the means of focussing acoustic energy from an array of acoustic transducers onto a target through a liquid medium where the improvement in the means for focussing comprises: a monolithic tray of plastic incorporating a multiplicity of Fresnel lenses and prisms, said plastic having a speed of sound less than that of the liquid medium, there being one said Fresnel lens for each acoustic transducer in the array, each said Fresnel lens being plano-concave in shape and each said Fresnel lens being positioned in said monolithic tray to achieve a focus on the target.
Claim 5
Dependent Claim
97 words
An improvement in the means of focussing acoustic energy from an array of acoustic transducers onto a target through a liquid medium where the improvement in the means for focussing comprises: a monolithic tray of plastic incorporating a multiplicity of Fresnel lenses and prisms, said plastic having a speed of sound less than that of the liquid medium, there being one said Fresnel lens for each acoustic transducer in the array, each said Fresnel lens being plano-concave in shape and each said Fresnel lens being positioned in said monolithic tray to achieve a focus on the target.
References Cited (Backward Citations)
US2423459A
Cited
US2937640A
Cited
US2827620A
Cited
US3017608A
Cited
US3090030A
Cited
US3559159A
Cited
US3903990A
Cited
US3913061A
Cited
US3958559A
Cited
US4003383A
Cited
US4084582A
Cited
US4391281A
Cited
US4274421A
Cited
US4211949A
Cited
US4442842A
Cited
US4319490A
Cited
US4330874A
Cited
US4387599A
Cited
US4441486A
Cited
US4445380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |