US4287033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical method for removing metallic sheaths
Assignee: Calspan Corp
•
Filing: 1980-04-14
•
Granted: 1981-09-01
•
Expires: 2000-04-14
Abstract
Abstract An electrochemical stripping process is employed to selectively remove the metallic sheath from a thermocouple or resistance element without affecting the core material. The sheath is connected as a consumable anode and is inserted to a depth corresponding to the amount of the sheath to be removed. The core material is electrically isolated from the sheath and is therefore unaffected by the electrochemical process.
Inventors
- 👤 James A. Weibel, Sr.
- 👤 Franklin A. Vassallo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:18
CPC Classifications
C; C25; C25F; C25F5/00; C25F3/00; C25F3/02; C25F3/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
A method for selectively removing a metallic sheath from an electrically insulated core while leaving the core unaffected and including the steps of: connecting a suitable cathode to a source of power and inserting the cathode into an acid mixture; connecting a metal sheath of an element as an anode and connecting the anode to the source of power; and inserting the sheath into the acid mixture to a depth corresponding to the amount of sheath to be removed whereby an electrical circuit is completed and the immersed portion of the sheath is electrochemically removed.
Claim 2
Independent Claim
95 words
A method for selectively removing a metallic sheath from an electrically insulated core while leaving the core unaffected and including the steps of: connecting a suitable cathode to a source of power and inserting the cathode into an acid mixture; connecting a metal sheath of an element as an anode and connecting the anode to the source of power; and inserting the sheath into the acid mixture to a depth corresponding to the amount of sheath to be removed whereby an electrical circuit is completed and the immersed portion of the sheath is electrochemically removed.
Claim 3
Independent Claim
126 words
A method for selectively removing a stainless steel sheath from an element having at least one electrically isolated wire in the core of the element without affecting said at least one wire in the core and including the steps of: connecting a lead cathode to a source of power and inserting the cathode into an acid mixture containing sulfuric acid and hydrochloric acid; connecting the stainless steel sheath of the element as an anode and connecting the anode to the source of power; and inserting the sheath into the acid mixture to a depth corresponding to the amount of sheath to be removed whereby an electrical circuit is completed and the immersed portion of the sheath is electrochemically removed without affecting said at least one wire.
Claim 4
Independent Claim
126 words
A method for selectively removing a stainless steel sheath from an element having at least one electrically isolated wire in the core of the element without affecting said at least one wire in the core and including the steps of: connecting a lead cathode to a source of power and inserting the cathode into an acid mixture containing sulfuric acid and hydrochloric acid; connecting the stainless steel sheath of the element as an anode and connecting the anode to the source of power; and inserting the sheath into the acid mixture to a depth corresponding to the amount of sheath to be removed whereby an electrical circuit is completed and the immersed portion of the sheath is electrochemically removed without affecting said at least one wire.
References Cited (Backward Citations)
US2434286A
Cited
US2739112A
Cited
US3151049A
Cited
US3257299A
Cited
US3394063A
Cited
US3492210A
Cited
US3699021A
Cited
DE2541675A1
Cited
US4098659A
Cited
US4111767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |