US2268589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing vitreous silica articles
Assignee: Heany Industrial Ceramic Corp
•
Filing: 1934-07-07
•
Granted: 1942-01-06
•
Expires: 1954-07-07
Abstract
No abstract record available.
Inventors
- 👤 Heany John Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:25
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/06; Y; Y10; Y10S; Y10S65/00; Y10S65/901
Claims Analysis
Total Claims: 0
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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) | 1945-01-05 | 1945-07-07 | 1946-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-05 | 1949-07-07 | 1950-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-05 | 1953-07-07 | 1954-01-06 | $7700.00 | Window Closed / Lapsed |