US3248235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-tarnish composition for coppercontaining surfaces
Assignee: 3M Co
•
Filing: 1961-09-28
•
Granted: 1966-04-26
•
Expires: 1981-09-28
Abstract
No abstract record available.
Inventors
- 👤 Donald M Pryor
- 👤 Louis F Cason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:00
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/10; C23G1/103; C11; C11D; C11D17/00; C11D17/0043; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/16; C23F11/161
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
AN AQEOUS ANTI-TARNISH COMPOSITION FOR COPPER WHICH CONSISTS ESSENTIALLY OF 0.01% TO 25% OF A WEAK ORGANIC ACID, 0.01% TO 25% OF AN ALKALI METAL HALIDE, 0.05% TO 1% OF A SURFACTANT, 0 TO 20% OF ABRASIVE, AND 1 TO 15% OF A MERCAPTAN OF THE FORMULA
Claim 2
Dependent Claim
47 words
AN AQEOUS ANTI-TARNISH COMPOSITION FOR COPPER WHICH CONSISTS ESSENTIALLY OF 0.01% TO 25% OF A WEAK ORGANIC ACID, 0.01% TO 25% OF AN ALKALI METAL HALIDE, 0.05% TO 1% OF A SURFACTANT, 0 TO 20% OF ABRASIVE, AND 1 TO 15% OF A MERCAPTAN OF THE FORMULA
References Cited (Backward Citations)
US2371143A
Cited
US2841501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |