Patent US3754912A successfully refreshed from Google Patents.
US3754912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical milling using fused powder particles as resist
Assignee: Primary Products Ingredients Americas LLC
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Filing: 1971-09-27
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Granted: 1973-08-28
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Expires: 1991-09-27
Abstract
Abstract Method of chemical milling which comprises the steps of exposing a metal layer bearing a light-sensitive layer capable of developing a Rd of 1.0 to 2.2 to actinic radiation to produce a potential Rd of 1.0 to 2.2; developing said light-sensitive layer with water-insoluble powder particles using physical force to embed the powder particles in the light-sensitive layer; removing non-embedded powder particles; fusing the water-insoluble powder particles to the metal layer by heating to form a stencil; and etching through the metal layer in the areas unprotected by the fused water-insoluble powder particles.
Inventors
- 👤 R Jones
- 👤 W Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:27
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; B; B41; B41M; B41M5/00; B41M5/0029; C; C23; C23F; C23F1/00; C23F1/02; G; G03; G03F; G03F7/00; G03F7/26; G03F7/28; G03G; G03G11/00; H05K2203/00; H05K2203/05; H05K2203/0502; H05K2203/0525; H05K2203/0562; H05K2203/0585; H05K2203/13; H05K2203/1333; H05K2203/1355
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
21 words
developing said light-sensitive layer with water-insoluble, resinous powder particles using physical force to embed the powder particles in the light-sensitive layer;
Claim 2
Independent Claim
10 words
The method of chemical milling comprising of the steps of:
Claim 3
Dependent Claim
24 words
developing said light-sensitive layer with water-insoluble, resinous powder particles using physical force to embed the powder particles as a monolayer in the light-sensitive layer;
Claim 4
Dependent Claim
24 words
developing said light-sensitive layer with water-insoluble, resinous powder particles using physical force to embed the powder particles as a monolayer in the light-sensitive layer;
Claim 5
Dependent Claim
4 words
removing non-embedded powder particles;
Claim 6
Dependent Claim
4 words
removing non-embedded powder particles;
Claim 7
Dependent Claim
4 words
removing non-embedded powder particles;
Claim 8
Dependent Claim
39 words
The process of claim 2, wherein the light-sensitive layer in the exposed areas is removed from the metal layer with a poor solvent for the remaining powder particles after the non-embedded powder particles are removed from the non-image areas.
Claim 9
Dependent Claim
48 words
The process of claim 2, wherein the water-insoluble powder particles are fused or sintered to the metal layer and the light-sensitive layer in the exposed areas is removed from the metal layer with a poor solvent for the remaining powder particles after step 3 and before step 4.
Claim 10
Dependent Claim
16 words
fusing the water-insoluble powder particles to the metal layer by heating to form a stencil; and
Claim 11
Dependent Claim
16 words
fusing the water-insoluble powder particles to the metal layer by heating to form a stencil; and
Claim 12
Dependent Claim
16 words
fusing the water-insoluble powder particles to the metal layer by heating to form a stencil; and
Claim 13
Dependent Claim
15 words
etching through the metal layer in the areas unprotected by the fused water-insoluble powder particles.
Claim 14
Dependent Claim
15 words
etching through the metal layer in the area unprotected by the fused water-insoluble powder particles.
Claim 15
Dependent Claim
15 words
etching through the metal layer in the areas unprotected by the fuSed water-insoluble powder particles.
Claim 16
Dependent Claim
30 words
The process of claim 2, wherein said positive-acting, light-sensitive layer comprises a film former selected from the group consisting of internally ethylenically unsaturated acids and internally ethylenically unsaturated acid esters.
Claim 17
Dependent Claim
16 words
The process of claim 5, wherein said ethylenically unsaturated acid moiety comprises a rosin acid moiety.
Claim 18
Dependent Claim
22 words
The process of claim 5, wherein said light-sensitive layer comprises a photoactivator selected from the group consisting of acyloins and vicinal diketones.
Claim 19
Dependent Claim
14 words
The process of claim 2, wherein said resinous powder particles comprise a thermoplastic polymer.
Claim 20
Dependent Claim
17 words
The process of claim 8, wherein said stencil is removed with an organic solvent after step 5.
Claim 21
Independent Claim
9 words
The method of chemical milling comprising the steps of:
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |