US3923231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion bonding of gold to gold
Assignee: United States Department of Energy
•
Filing: 1975-04-11
•
Granted: 1975-12-02
•
Expires: 1995-04-11
Abstract
Abstract Low temperature diffusion bonds of gold to gold in which the bond tensile strength exceeds the yield point of gold, made by wetting the bonding surfaces with mercury and clamping the wetted surfaces together with moderate pressure, at a temperature of 100*C for a period of 22-30 days.
Inventors
- 👤 Edward Catalano
- 👤 Donald L Ornellas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:18
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/233; B23K35/00; B23K35/001; B23K35/007
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
9 words
A PROCESS FOR DIFFUSION BONDING GOLD TO GOLD COMPRISING:
Claim 2
Dependent Claim
9 words
A PROCESS FOR DIFFUSION BONDING GOLD TO GOLD COMPRISING:
Claim 3
Dependent Claim
16 words
PLACING A MERCURY INTERLAYER BETWEEN TWO SIMILARY SURFACE GOLD PIECE WHICH ARE TO BE BONDED TOGETHER,
Claim 4
Dependent Claim
16 words
PLACING A MERCURY INTERLAYER BETWEEN TWO SIMILARY SURFACE GOLD PIECE WHICH ARE TO BE BONDED TOGETHER,
Claim 5
Dependent Claim
12 words
PRESSING TOGETHER THE TWO GOLD SURFACES WITH THE MERCURY INTERLAYER BETWEEN THEM,
Claim 6
Dependent Claim
12 words
PRESSING TOGETHER THE TWO GOLD SURFACES WITH THE MERCURY INTERLAYER BETWEEN THEM,
Claim 7
Dependent Claim
38 words
The process of claim 1 wherein a minimal amount of mercury is applied in liquid form by wetting with mercury those surfaces to be bonded and removing any mercury in excess of that necessary to wet such surfaces.
Claim 8
Dependent Claim
12 words
pressing together the two gold surfaces with the mercury interlayer between them,
Claim 9
Dependent Claim
12 words
pressing together the two gold surfaces with the mercury interlayer between them,
Claim 10
Dependent Claim
16 words
while pressing the gold-mercury-gold assembly together, heating the assemly to a temperature of about 100*C, and
Claim 11
Dependent Claim
16 words
while pressing the gold-mercury-gold assembly together, heating the assemly to a temperature of about 100*C, and
Claim 12
Dependent Claim
35 words
The process of claim 1 wherein the gold-mercury-gold assembly is pressed together with sufficient pressure to bring the gold and mercury into good contact, but with less pressure than that needed to deform the gold.
Claim 13
Dependent Claim
16 words
WHILE PRESSING THE GOLD-MERCURY-GOLD ASSEMBLY TOGETHER, HEATING THE ASSEMLY TO A TEMPERATURE OF ABOUT 100*C, AND
Claim 14
Dependent Claim
16 words
WHILE PRESSING THE GOLD-MERCURY-GOLD ASSEMBLY TOGETHER, HEATING THE ASSEMLY TO A TEMPERATURE OF ABOUT 100*C, AND
Claim 15
Dependent Claim
16 words
MAINTAINING SAID ASSEMBLY UNDER PRESSURE AT SAID TEMPERATURE FOR A PERIOD OF TIME EXCEEDING TWO DAYS.
Claim 16
Dependent Claim
16 words
MAINTAINING SAID ASSEMBLY UNDER PRESSURE AT SAID TEMPERATURE FOR A PERIOD OF TIME EXCEEDING TWO DAYS.
Claim 17
Dependent Claim
29 words
The process of claim 1 wherein the gold surfaces which are to be bonded together have a surface finish equal to or smoother than 3 X 10 6 m.
Claim 18
Dependent Claim
16 words
maintaining said assembly under pressure at said temperature for a period of time exceeding two days.
Claim 19
Dependent Claim
16 words
maintaining said assembly under pressure at said temperature for a period of time exceeding two days.
Claim 20
Dependent Claim
20 words
The process of claim 1 where said assembly is maintained under pressure at said temperature for at least 22 days.
References Cited (Backward Citations)
US2438967A
Cited
US3579808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |