Carl Zeiss Stiftung
🏢 View company profile →709Patents
1Active
709Granted
46Portfolio score
Filing activity: Oct 22, 1974 → Nov 29, 2006 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4825091A | Optoelectronic distance sensor with visible pilot beam | Physics | 268 | Expired |
| US4579430A | Method and apparatus for forming an image of the ocular fundus | Human Necessities | 244 | Expired |
| US5123902A | Method and apparatus for performing surgery on tissue wherein a laser beam is applied to the tissue | Human Necessities | 231 | Expired |
| US4529275A | Continuous charge control for electrochromic layers | Physics | 219 | Expired |
| US5359417A | Surgical microscope for conducting computer-supported stereotactic microsurgery and a method for operating the same | Human Necessities | 215 | Expired |
| US4660970A | Method and apparatus for the contact-less measuring of objects | Physics | 211 | Expired |
| US5795294A | Procedure for the correlation of different coordinate systems in computer-supported, stereotactic surgery | Human Necessities | 192 | Expired |
| US4407008A | Method and apparatus for light-induced scanning-microscope display of specimen parameters and of their distribution | Physics | 176 | Expired |
| US4769763A | Control for coordinate measuring instruments | Physics | 174 | Expired |
| US4427889A | Method and apparatus for molecular spectroscopy, particularly for the determination of products of metabolism | Physics | 167 | Expired |
| US5884410A | Sensing system for coordinate measuring equipment | Physics | 166 | Expired |
| US5675401A | Illuminating arrangement including a zoom objective incorporating two axicons | Physics | 158 | Expired |
| US4961267A | Method and apparatus for making coordinate measurements | Physics | 157 | Expired |
| US6191880A | Radial polarization-rotating optical arrangement and microlithographic projection exposure system incorporating said arrangement | Physics | 152 | Expired |
| US5331358A | Vision testing system for testing the sight function of a patient | Electricity | 149 | Expired |
| US4662370A | Apparatus for performing lamellar refractive corneal surgery | Human Necessities | 134 | Expired |
| US4397556A | Material-testing method and apparatus | Physics | 133 | Expired |
| US5038258A | Illuminating arrangement for illuminating an object with incident light | Physics | 131 | Expired |
| US5615489A | Method of making coordinate measurements on workpieces | Physics | 125 | Expired |
| US6252712A | Optical system with polarization compensator | Emerging Cross-Sectional Technologies | 123 | Expired |
| US5396712A | Coordinate measuring device | Physics | 115 | Expired |
| US5401270A | Applicator device for laser radiation | Human Necessities | 109 | Expired |
| US4250888A | Heartbeat monitoring process and device | Human Necessities | 107 | Expired |
| US6236906A | Process and apparatus for hand-controlled guiding of an instrument in a predetermined movement region | Emerging Cross-Sectional Technologies | 107 | Expired |
| US4703522A | Laser safety eyeglasses | Physics | 100 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.