Bizarre Patents
A vest or belt is integrally formed with tubular, pet receiving passageways which extend around the wearer's body and terminate in pocket-like chambers for feeding and retrieval.
PatentStorm News
Make the Most of PatentStorm
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest patents by subscribing to an RSS feed.
Got questions? Ask a Patent Expert!
Registered users: Manage your profile, comments and alerts.
US Patent 4179196 - Compact subjective refractive instrument
US Patent Issued on December 18, 1979
Estimated Patent Expiration Date:
September 30, 1997Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
September 30, 1997Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA compact ophthalmic instrument for refraction of patient's eyes is obtained by substantial folding of the optical system. The optical system is folded in one location using a reflection means that moves to vary the location of a target image being viewed by a patient for identifying the spherical power of a corrective lens, if any, required by the patient. A second folded portion of the optical system contains a cylinder means for cylindrically varying the target image. | InventorsAssigneeApplicationNo. 05/838178 filed on 09/30/1977US Classes:351/237, Including target image projection351/241, Astigmatism type351/243IlluminatedExaminersPrimary: Corbin, John K.Assistant: Bovernick, Rodney B. Attorney, Agent or FirmUS Patent References3669530, 4015889, Shunt for providing a direct electrical connectionIssued on: 04/05/1977 Inventor: Blanchet4105302Automatic refraction apparatus and method Issued on: 08/08/1978 Inventor: Tate, Jr. International ClassA61B 3/13 (20060101) |
