US4159075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hermetic bonded seal
Assignee: Kearfott Guidance and Navigation Corp
•
Filing: 1977-12-02
•
Granted: 1979-06-26
•
Expires: 1997-12-02
Abstract
Abstract A method for providing at room temperature a hermetic bonded seal between the surfaces of glass, ceramics, metals or any combination of these. The method comprises the steps of polishing the surfaces to be bonded and then plasma cleaning the surfaces. Next, a chemically cleaned bonding material such as indium is applied to the surfaces and a force is applied to the surfaces to be sealed at room temperature for a limited period of time to affect the bonded seal.
Inventors
- 👤 Bo H. G. Ljung
- 👤 James G. Koper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:09
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/097; B; B23; B23K; B23K20/00; B23K20/22; B23K20/24
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
52 words
The method of making a high strength hermetic bonded seal comprising: cleaning the surfaces to be bonded with a plasma cleaner, positioning an indium wire on the surfaces to be bonded together, and applying pressure to the bonding surface at room temperature so as to effect a bonded seal between said surfaces.
Claim 2
Independent Claim
52 words
The method of making a high strength hermetic bonded seal comprising: cleaning the surfaces to be bonded with a plasma cleaner, positioning an indium wire on the surfaces to be bonded together, and applying pressure to the bonding surface at room temperature so as to effect a bonded seal between said surfaces.
Claim 3
Dependent Claim
20 words
The method of claim 1 comprising: chemically cleaning said indium wire prior to positioning said indium wire on said surfaces.
Claim 4
Dependent Claim
20 words
The method of claim 2 comprising: polishing said surfaces to be bonded so that they are substantially free of scratches.
Claim 5
Dependent Claim
14 words
The method of claim 3 comprising: bonding a glass material to a ceramic material.
Claim 6
Dependent Claim
14 words
The method of claim 4 comprising: bonding a ceramic material to a metallic material.
Claim 7
Dependent Claim
9 words
The method of claim 5 comprising: bonding glass surfaces.
Claim 8
Dependent Claim
9 words
The method of claim 5 comprising: bonding ceramic surfaces.
Claim 9
Dependent Claim
9 words
The method of claim 7 comprising: bonding metallic surfaces.
Claim 10
Independent Claim
72 words
The method of making a high strength hermetic bonded seal between ceramic and metallic surfaces comprising: cleaning the surfaces to be bonded with a plasma cleaner, polishing said surfaces to be bonded so that said surfaces are substantially free of scratches, positioning an indium wire on said surfaces to be bonded together, and applying pressure to the bonding surface at room temperature so as to effect a bonded seal between said surfaces.
Claim 11
Independent Claim
72 words
The method of making a high strength hermetic bonded seal between ceramic and metallic surfaces comprising: cleaning the surfaces to be bonded with a plasma cleaner, polishing said surfaces to be bonded so that said surfaces are substantially free of scratches, positioning an indium wire on said surfaces to be bonded together, and applying pressure to the bonding surface at room temperature so as to effect a bonded seal between said surfaces.
Claim 12
Independent Claim
100 words
The method of making a high strength hermetic bonded seal between ceramic and metallic surfaces comprising: cleaning the surfaces to be bonded with a plasma cleaner, polishing said surfaces to be bonded so that said surfaces are substantially free of scratches, chemically cleaning an indium wire for use in bonding said surfaces in a solvent made of freon and then etching said wire in a solution of hydrochloric acid, positioning said indium wire on said surfaces to be bonded together, and applying pressure to the bonding surface at room temperature so as to effect a bonded seal between said surfaces.
Claim 13
Independent Claim
100 words
The method of making a high strength hermetic bonded seal between ceramic and metallic surfaces comprising: cleaning the surfaces to be bonded with a plasma cleaner, polishing said surfaces to be bonded so that said surfaces are substantially free of scratches, chemically cleaning an indium wire for use in bonding said surfaces in a solvent made of freon and then etching said wire in a solution of hydrochloric acid, positioning said indium wire on said surfaces to be bonded together, and applying pressure to the bonding surface at room temperature so as to effect a bonded seal between said surfaces.
Claim 14
Dependent Claim
38 words
The method of claim 13 comprising: positioning an indium wire having a diameter of 0.6 mm between said surfaces, and applying a force to said surfaces at room temperature of approximately 100 Newton per cm length of wire.
Claim 15
Independent Claim
83 words
The method of making a high strength hermetic bonded seal comprising: cleaning the surfaces to be bonded with a plasma consisting of a reaction gas of 97% He and 3% O 2 while subjecting said surfaces to a 300 W high frequency radio power in a reaction chamber for approximately four minutes, positioning an indium wire on the surfaces to be bonded together, and applying pressure to the bonding surface at room temperature so as to effect a bonded seal between said surfaces.
Claim 16
Independent Claim
83 words
The method of making a high strength hermetic bonded seal comprising: cleaning the surfaces to be bonded with a plasma consisting of a reaction gas of 97% He and 3% O 2 while subjecting said surfaces to a 300 W high frequency radio power in a reaction chamber for approximately four minutes, positioning an indium wire on the surfaces to be bonded together, and applying pressure to the bonding surface at room temperature so as to effect a bonded seal between said surfaces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |