Patent US4500967A successfully refreshed from Google Patents.
Patent US2584031A successfully refreshed from Google Patents.
US2584031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deenameling process
Assignee: Lawndale Enameling Co
•
Filing: 1950-01-25
•
Granted: 1952-01-29
•
Expires: 1970-01-25
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Lander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:20
CPC Classifications
C; C23; C23D; C23D17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN A DE-ENAMELING PROCESS, THE STEPS OF IMMERSING THE ENAMELED PIECE IN A BATH OF SODIUM HYDROXIDE AND SODIUM FLUORIDE SOLUTION AT A TEMPERATURE OF FROM ABOUT 280 TO 350* F. DISSOLVE THE ENAMEL WHILE LEAVING A FILM OF SLUDGE ON THE SURFACE OF THE PIECE, AND SAND-SPRAYING THE PIECE AT PRESSURE OF FROM 30 TO 60 POUNDS TO REMOVE THE SLUDGE FILM THEREFROM.
Claim 2
Dependent Claim
64 words
IN A DE-ENAMELING PROCESS, THE STEPS OF IMMERSING THE ENAMELED PIECE IN A BATH OF SODIUM HYDROXIDE AND SODIUM FLUORIDE SOLUTION AT A TEMPERATURE OF FROM ABOUT 280 TO 350* F. DISSOLVE THE ENAMEL WHILE LEAVING A FILM OF SLUDGE ON THE SURFACE OF THE PIECE, AND SAND-SPRAYING THE PIECE AT PRESSURE OF FROM 30 TO 60 POUNDS TO REMOVE THE SLUDGE FILM THEREFROM.
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) | 1955-01-28 | 1955-07-30 | 1956-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-28 | 1959-07-30 | 1960-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-28 | 1963-07-30 | 1964-01-29 | $7700.00 | Window Closed / Lapsed |