US3907622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming negatives for chemical etching process
Assignee: Armstrong World Industries Inc
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Filing: 1974-08-16
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Granted: 1975-09-23
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Expires: 1994-08-16
Abstract
Abstract A technique for the generation of film negatives which will be used in a chemical etching process to form an embossing plate. The film negatives are taken of a model which simulates the embossing plate configuration. The model is made from dark material and the surface thereof is sprayed with a light coating. The surface of the model is ground down with a series of incremental planar steps and negatives are made after each grinding step. Each grinding step removes some light coating and exposes more of the dark mold material. The contrast of the light and dark areas generates negatives which are useful for making the finished embossing plate by a chemical etching process.
Inventors
- 👤 Jr Jacob A Otthofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:54
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/0017
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
204 words
A METHOD OF FORMING A THREE-DIMENSIONAL SURFACE INCLUDING THHE STEPS OF PREPARING A MODEL OF THE THREE-DIMENSIONAL SURFACE TO BE DUPLICATED WITH THE MATERIAL OF THE MODEL BEING OF A DEFINITE SHADE, COATING THE SURFACE OF THE MODEL TO BE REPORDUCED WITH A MATERIAL WHICH IS OF A CONTRASTING SHADE, REMOVING FROM A FIRST PLANE OF THE MODEL SURFACE A PORTION OF THE CONTRASTING SHADE COATING SO AS TO EXPOSE A PORTION OF THE UNDERLYING MODEL MATERIAL, PHOTOGRAPHING THE MODEL SURFACE TO BE REPRODUCED IN THIS CONDITION OF EXPOSED AREAS OF A DEFINITE SHADE WHICH IS IN CONTRAST TO THE COATED AREAS, REMOVING ADDITIONAL PORTIONS OF OF THE CONTRASTING SHADE COATING AND DEFINITE SHADE MODEL MATERIAL FROM A SECOND PLANE PARALLEL TO THE FIRST PLANE TO EXPOSE MORE OF THE DEFINITE SHADE MODEL MATERIAL UNDERLYING THE CONSTRASTING SHADE SURFACE COATING, PHOTOGRAPHING THIS SURFACE CONFIGURATION, AND CONTINUING THIS SEQUENCE OF REMOVING IN PARALLEL PLANES ADDITONAL PORTIONS OF THE CONTRST SHADE COATING AND DEFINITE SHADE MODEL MATERIAL FROM THE SURFACE OF THE MODEL TO BE REPRODUCED AND PHOTOGRAPHING THAT SURFACE AFTER EACH REMOVAL TO SECURE A SERIES OF NEGATIVES WHICH PROVIDE IN EFFECT A SERIES OF ELEVATIONAL CROSS-SECTIONAL VIEWS OF THE MODEL SURFACE TO BE REPRODUCED.
Claim 2
Independent Claim
204 words
A METHOD OF FORMING A THREE-DIMENSIONAL SURFACE INCLUDING THHE STEPS OF PREPARING A MODEL OF THE THREE-DIMENSIONAL SURFACE TO BE DUPLICATED WITH THE MATERIAL OF THE MODEL BEING OF A DEFINITE SHADE, COATING THE SURFACE OF THE MODEL TO BE REPORDUCED WITH A MATERIAL WHICH IS OF A CONTRASTING SHADE, REMOVING FROM A FIRST PLANE OF THE MODEL SURFACE A PORTION OF THE CONTRASTING SHADE COATING SO AS TO EXPOSE A PORTION OF THE UNDERLYING MODEL MATERIAL, PHOTOGRAPHING THE MODEL SURFACE TO BE REPRODUCED IN THIS CONDITION OF EXPOSED AREAS OF A DEFINITE SHADE WHICH IS IN CONTRAST TO THE COATED AREAS, REMOVING ADDITIONAL PORTIONS OF OF THE CONTRASTING SHADE COATING AND DEFINITE SHADE MODEL MATERIAL FROM A SECOND PLANE PARALLEL TO THE FIRST PLANE TO EXPOSE MORE OF THE DEFINITE SHADE MODEL MATERIAL UNDERLYING THE CONSTRASTING SHADE SURFACE COATING, PHOTOGRAPHING THIS SURFACE CONFIGURATION, AND CONTINUING THIS SEQUENCE OF REMOVING IN PARALLEL PLANES ADDITONAL PORTIONS OF THE CONTRST SHADE COATING AND DEFINITE SHADE MODEL MATERIAL FROM THE SURFACE OF THE MODEL TO BE REPRODUCED AND PHOTOGRAPHING THAT SURFACE AFTER EACH REMOVAL TO SECURE A SERIES OF NEGATIVES WHICH PROVIDE IN EFFECT A SERIES OF ELEVATIONAL CROSS-SECTIONAL VIEWS OF THE MODEL SURFACE TO BE REPRODUCED.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the model material is made of a dark material and is provided with an overcoating of a light material.
Claim 4
Dependent Claim
40 words
The method of claim 2 wherein the mold is sequentially ground in a series of steps to remove approximately 0.002 inches in thickness of contrasting shade coating and definite shade model material from the model surface between each photographic step.
Claim 5
Dependent Claim
121 words
THE METHOD OF CLAIM 3 WHEREIN THERE IS PROVIDED A FLAT SURFACE OF ETCHABLE MATERIAL, COATING SAID FLAT SURFACE WITH A PHOTO SENSITIVE RESIST AND USING ONE OF THE ABOVE-MENTIONED NEGATIVES FOR CONDITIONING THE PHOTO SENSITIVE RESIST TO COAT CERTAIN AREAS OF THE ETCHABLE MATERIAL AND TO BE REMOVABLE FROM OTHER AREAS OF THE ETCHABLE MATERIAL, REMOVING THE REMOVABLE RESIST COATING MATERIAL AND PLACING THE ETCHABLE MATERIAL IN AN ETCHING SOLUTION TO REMOVE A PORTION OF THE ETCHABLE MATERIAL NOT PROTECTED BY THE PHOTO SENSITIVE RESIST, AND REPEATING THE ABOVE STEPS OF APPLYING THE PHOTO SENSITIVE RESIST AND DIFFERENT ABOVE-DEVELOPED PHOTOGRAPHIC NEGATIVES TO GENERATE A SURFACE CONFIGURATION IN THE ETCHABLE MATERIAL WHICH SUBSTANTIALLY DUPLICATES THE SURFACE CONFIGURATION OF THE ABOVE-MENTIONED MODEL.
References Cited (Backward Citations)
US3428503A
Cited
US3711346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |