US3748123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for metal recovery
Assignee: Bakker Development Corp
•
Filing: 1971-07-14
•
Granted: 1973-07-24
•
Expires: 1991-07-14
Abstract
Abstract Metals, particularly precious metals, embedded in or otherwise confined by enzyme-degradable organic media as in photographic film or printed circuits are recovered in the form of metal or metal compounds by breakdown of said media primarily by enzymes.
Inventors
- 👤 L Bakker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:09
CPC Classifications
G; G03; G03C; G03C11/00; G03C11/24; C; C22; C22B; C22B11/00; C22B11/04; C22B3/00; C22B3/18; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
A method in accordance with claim 1 wherein said photographic film is shredded prior to being subjected to said first aqueous solution.
Claim 2
Dependent Claim
26 words
A method in accordance with claim 2 wherein said second aqueous solution is heated to temperatures in the range of about 30* to about 70* C.
Claim 3
Dependent Claim
12 words
A method in accordance with claim 1 wherein said protease is papain.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |