US4879261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low Dielectric constant compositions
Assignee: EIDP Inc
•
Filing: 1988-08-23
•
Granted: 1989-11-07
•
Expires: 2008-08-23
Abstract
Abstract An alkali-free composition for making a ceramic dielectric body having a dielectric constant less than 5.0, which is a mixture of finely divided particles consisting essentially of 70-85% wt. silica and 15-30% wt. zinc borate flux. This composition can be used to make green tape and multilayer devices having internal copper conductors such as multilayer capacitors and multilayer interconnects.
Inventors
- 👤 Ian Burn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:55
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/008; H01G4/0085; B; B22; B22F; B22F1/00; B22F1/10; B28; B28B; B28B1/00; B28B1/002; B32; B32B; B32B18/00; C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63424; C04B35/638; C04B41/00; C04B41/45; C04B41/50; C04B41/51; C04B41/5127; C04B41/5188; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/098; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6562; C04B2235/6567; C04B2235/658; C04B2235/6582; C04B2235/6583; C04B2235/66; C04B2235/661; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/343; C04B2237/50; C04B2237/70; C04B2237/704; H05K1/09; H05K1/092; H05K2203/00; H05K2203/08; H05K2203/086; H05K2203/11; H05K2203/1126; H05K3/00; H05K3/10; H05K3/12; H05K3/1283; H05K3/1291
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
An alkali-free composition for forming a ceramic dielectric body having a dielectric constant less than 5.0, which is a mixture of finely divided particles consisting essentially of: (a) 70-85% by weight silica particles and (b) 15-30% by weight zinc borate flux particles.
Claim 2
Dependent Claim
42 words
An alkali-free composition for forming a ceramic dielectric body having a dielectric constant less than 5.0, which is a mixture of finely divided particles consisting essentially of: (a) 70-85% by weight silica particles and (b) 15-30% by weight zinc borate flux particles.
Claim 3
Dependent Claim
36 words
The composition of claim 1 wherein the zinc borate flux consists essentially of zinc oxide and boron oxide and the mole ratio of zinc oxide to boron oxide is in the range of 3/1 to 1/1.
Claim 4
Dependent Claim
22 words
The composition of claim 2 wherein the mole ratio of zinc oxide to boron oxide is 2/1 in the zinc borate flux.
Claim 5
Dependent Claim
10 words
The composition of claim 1 wherein the silica is alpha-quartz.
Claim 6
Dependent Claim
25 words
The composition of claim 1 wherein the formed ceramic dielectric body has a thermal coefficient of expansion in the range of 1.5 to 8.5 ppm/°C.
Claim 7
Dependent Claim
19 words
The composition of claim 1 in which the mixture of finely divided particles is dispersed in an organic medium.
Claim 8
Dependent Claim
20 words
The composition of claim 6 in which the organic medium is comprised of a polymeric binder dissolved in organic solvent.
Claim 9
Dependent Claim
21 words
The composition of claim 7 in which the organic solvent is a volatile solvent and the dispersion is of castable consistency.
References Cited (Backward Citations)
SU480659A1
Cited
JPS5399768A
Cited
US4624934A
Cited
US4654095A
Cited
US4655864A
Cited
US4752531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |