Patent US3609033A successfully refreshed from Google Patents.
US3609033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mask for etching enlargement
Assignee: Buckbee Mears Co
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Filing: 1969-08-15
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Granted: 1971-09-28
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Expires: 1989-08-15
Abstract
Abstract A mask has a metallic material, preferably cold-rolled steel, covered by an etchant-resist layer on both sides. On one side the layer has a circular area of diameter X2 void of etchant resist, and on the second side the layer has a circular area of diameter X3 and an annular area of outer diameter X1 both void of etchant resist. The three areas are coaxially aligned.
Inventors
- 👤 John J Frantzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:04
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
An aperture mask suitable for etching enlarging comprising: a metallic material having a thickness T; a first layer of etchant resist located one side of said material and a second layer of etchant resist located on the opposite side of said material; said first layer of etchant resist having a first circular area of diameter X2 being substantially void of etchant resist; said second layer of etchant resist having a second circular area having a diameter X3 being substantially void of etchant resist, said second layer of etchant resist having an annular area substantially void of etchant resist, said annular area having an outer diameter X1, said outer diameter X1 being substantially equal to the diameter X2 of said first circular area.
Claim 2
Dependent Claim
122 words
An aperture mask suitable for etching enlarging comprising: a metallic material having a thickness T; a first layer of etchant resist located one side of said material and a second layer of etchant resist located on the opposite side of said material; said first layer of etchant resist having a first circular area of diameter X2 being substantially void of etchant resist; said second layer of etchant resist having a second circular area having a diameter X3 being substantially void of etchant resist, said second layer of etchant resist having an annular area substantially void of etchant resist, said annular area having an outer diameter X1, said outer diameter X1 being substantially equal to the diameter X2 of said first circular area.
Claim 3
Dependent Claim
25 words
The inventions as described in claim 1 wherein said first circular area, said second circular area and said annular area are located in coaxial alignment.
Claim 4
Dependent Claim
24 words
The inventions as described in claim 2 wherein the width of the annular area L is approximately one-fourth the thickness T of said material.
Claim 5
Dependent Claim
12 words
Inventions as described in claim 3 wherein said material compromises cold-rolled steel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |