US3928683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibitor
Assignee: AT&T Inc
•
Filing: 1974-05-06
•
Granted: 1975-12-23
•
Expires: 1994-05-06
Abstract
Abstract Electrical devices including metal surfaces to which electrical connections are to be made by soldering are described, such surfaces having a siloxane prepolymer coating deposited thereon. The siloxane coatings protect the metal surfaces against surface alteration which would tend to render soldering thereto more difficult.
Inventors
- 👤 Edwin Arthur Chandross
- 👤 Valerie Jeanne Kuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:46
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C09D183/08; B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; B05D2518/00; B05D2518/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31678
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
AN ELECTRIC DEVICE HAVING A METAL SURFACE TO AT LEAST A PORTION OF WHICH ELECTRICAL CONNECTIONS ARE TO BE MADE BY SOLDERING, AND HAVING A COATING ON SAID PORTION WHICH PROTECTS IT AGAINST SURFACE ALERATION WHICH WOULD TEND TO RENDER SUCH SOLDERING MORE DIFFICULT BUT THROUGH WHICH COATING SOLDERING CAN BE EFFECTED, SAID COATING COMPRISING A POLYSILOXANE HAVING SIDE CHAIN SUBSTITUENTS MADE UP OF TERMINAL ALKYL GROUPS, CONTAINING AT LEAST 3 CARBON ATOMS, JOINED BY MEANS OF AMIDE LINKAGES TO ALKYLENE GROUPS, CONTAINING NOT MORE THAN 6 CARBON ATOMS, WHICH ARE IN TURN BONDED TO SILICON ATOMS OF THE SILOXANE.
Claim 2
Dependent Claim
100 words
AN ELECTRIC DEVICE HAVING A METAL SURFACE TO AT LEAST A PORTION OF WHICH ELECTRICAL CONNECTIONS ARE TO BE MADE BY SOLDERING, AND HAVING A COATING ON SAID PORTION WHICH PROTECTS IT AGAINST SURFACE ALERATION WHICH WOULD TEND TO RENDER SUCH SOLDERING MORE DIFFICULT BUT THROUGH WHICH COATING SOLDERING CAN BE EFFECTED, SAID COATING COMPRISING A POLYSILOXANE HAVING SIDE CHAIN SUBSTITUENTS MADE UP OF TERMINAL ALKYL GROUPS, CONTAINING AT LEAST 3 CARBON ATOMS, JOINED BY MEANS OF AMIDE LINKAGES TO ALKYLENE GROUPS, CONTAINING NOT MORE THAN 6 CARBON ATOMS, WHICH ARE IN TURN BONDED TO SILICON ATOMS OF THE SILOXANE.
Claim 3
Dependent Claim
19 words
Electrical device in accordance with claim 1 wherein the polysiloxane is comprised of repeating units of the general formula:
Claim 4
Dependent Claim
18 words
Electrical device in accordance with claim 2 wherein m is 3, r is 2 and n is 7.
Claim 5
Dependent Claim
18 words
Electrical device in accordance with claim 1 wherein the polysiloxane coating has a thickness ranging from 0.1-5 microns.
Claim 6
Dependent Claim
13 words
Electrical device in accordance with claim 1 wherein the metal surface comprises copper.
Claim 7
Dependent Claim
13 words
Electrical device in accordance with claim 3 wherein the metal surface comprises copper.
Claim 8
Dependent Claim
94 words
Technique for promoting the solderability of a metal surface to at least a portion of which electrical connections are to be made by soldering which comprises the steps of a. coating the surface with a thin film of a polysiloxane having side chain substituents made up of terminal alkyl groups, containing at least 3 carbon atoms, joined by means of amide linkages to alkylene groups, containing not more than 6 carbon atoms, which are in turn bonded to silicon atoms of the siloxane, and b. curing the coating to a state of reduced solubility.
Claim 9
Dependent Claim
94 words
Technique for promoting the solderability of a metal surface to at least a portion of which electrical connections are to be made by soldering which comprises the steps of a. coating the surface with a thin film of a polysiloxane having side chain substituents made up of terminal alkyl groups, containing at least 3 carbon atoms, joined by means of amide linkages to alkylene groups, containing not more than 6 carbon atoms, which are in turn bonded to silicon atoms of the siloxane, and b. curing the coating to a state of reduced solubility.
Claim 10
Dependent Claim
44 words
Technique in accordance with claim 7 wherein said polysiloxane is obtained by hydrolysis and partial condensation of an acylated aminoalkyltrialkoxysilane in a solvent by reacting it with a strong acid and water in a ratio of siloxane to water ranging from 1:1 to 1:2.5.
Claim 11
Dependent Claim
35 words
Technique in accordance with claim 7 wherein hydrolysis and partial condensation are effected by reacting the aminoalkyltrialkoxysilane with a strong acid and water in a ratio of silane to water ranging from 1:1 to 1:2.5.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |