Patent US2428187A successfully refreshed from Google Patents.
US2428187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inhibiting attack on glass surfaces by caustic soda solutions
Assignee: Wyandotte Chemicals Corp
•
Filing: 1943-08-26
•
Granted: 1947-09-30
•
Expires: 1963-08-26
Abstract
No abstract record available.
Inventors
- 👤 Walter F Wegst
- 👤 Perle N Burkard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:44
CPC Classifications
C; C03; C03C; C03C23/00; C03C15/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1950-09-29 | 1951-03-31 | 1951-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-29 | 1955-03-31 | 1955-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-29 | 1959-03-31 | 1959-09-30 | $7700.00 | Window Closed / Lapsed |