US4304612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treatment to remove harmful material from electric products impregnated with poly-chlorinated-biphenyl
Assignee: Fuji Electric Co Ltd
•
Filing: 1980-10-10
•
Granted: 1981-12-08
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Expires: 2000-10-10
Abstract
Abstract A method is provided for removing the harmful material from electrical products such as capacitors prior to their disposal. Poly-chlorinated-biphenyl is removed from electrical products such as capacitors by thermal decomposition.
Inventors
- 👤 Takehiko Masuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:01
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/005; C10; C10B; C10B49/00; C10B49/02; C10B53/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A method of treatment to remove harmful material from an electric product containing aluminum foil and insulating paper impregnated with poly-chlorinated-biphenyl which comprises: (a) burning or dry distilling the product in the absence of oxygen to a temperature of about 350° C. to 1200° C.; and subsequently (b) exposing the heated product to oxygen or a mixture of gases containing oxygen in order that the aluminum oxidizes rapidly generating temperatures of about 1800° C.
Claim 2
Independent Claim
74 words
A method of treatment to remove harmful material from an electric product containing aluminum foil and insulating paper impregnated with poly-chlorinated-biphenyl which comprises: (a) burning or dry distilling the product in the absence of oxygen to a temperature of about 350° C. to 1200° C.; and subsequently (b) exposing the heated product to oxygen or a mixture of gases containing oxygen in order that the aluminum oxidizes rapidly generating temperatures of about 1800° C.
Claim 3
Dependent Claim
25 words
A method as described in claim 1 which comprises heating the electrical product in step (a) to a temperature of 500° C. to 1000° C.
References Cited (Backward Citations)
US3650830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |