Patent US4817024A successfully refreshed from Google Patents.
US4817024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectacle-frame shape data producing method
Assignee: Hoya Corp
•
Filing: 1985-02-28
•
Granted: 1989-03-28
•
Expires: 2005-02-28
Abstract
Abstract A spectacle-frame shape data producing method in which a spline interpolation function is used to digitize the shape M of a spectacle frame to provide spectacle-frame shape data, and the shape M of the spectacle frame is obtained by a lens maker's factory to produce spectacle lenses having prescribed values and an optimum thickness conforming to the spectacle frame.
Inventors
- 👤 Tsuyoshi Saigoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:24
CPC Classifications
G; G02; G02C; G02C13/00; G02C13/003; G06; G06F; G06F30/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A method of producing spectacle-frame shape data, comprising the steps of: (a) drawing a shape of a spectacle-frame to be processed, (b) plotting drawn positions of said spectacle-frame shape by position processing means for providing information on such positions, and inputting a predetermined number of extremest side-point positions of the spectacle-frame shape to a computer, and (c) producing data between said extremest side-point positions by using a spline interpolation function which is stored in said computer beforehand, and thereafter drawing and reproducing said shape of the spectacle-frame on a display screen thereby to input the spectacle-frame shape data to the computer.
Claim 2
Independent Claim
101 words
A method of producing spectacle-frame shape data, comprising the steps of: (a) drawing a shape of a spectacle-frame to be processed, (b) plotting drawn positions of said spectacle-frame shape by position processing means for providing information on such positions, and inputting a predetermined number of extremest side-point positions of the spectacle-frame shape to a computer, and (c) producing data between said extremest side-point positions by using a spline interpolation function which is stored in said computer beforehand, and thereafter drawing and reproducing said shape of the spectacle-frame on a display screen thereby to input the spectacle-frame shape data to the computer.
Claim 3
Dependent Claim
14 words
Method of claim 1 wherein a digitizer is used in said position processing means.
Claim 4
Dependent Claim
32 words
Method of claim 1 wherein a liquid crystal display unit is used in said position processing means for receiving the shape as input information and for generating such shape as corresponding output.
References Cited (Backward Citations)
US3534396A
Cited
EP0021998A1
Cited
US4361830A
Cited
EP0061918A1
Cited
EP0092364A1
Cited
US4524419A
Cited
US4573121A
Cited
US4616107A
Cited
US4578768A
Cited
US4578768B1
Cited
US4713496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |