Patent US2984868A successfully refreshed from Google Patents.
US2984868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making fused quartz fibers
Assignee: Engelhard Industries Inc
•
Filing: 1958-03-20
•
Granted: 1961-05-23
•
Expires: 1978-03-20
Abstract
No abstract record available.
Inventors
- 👤 James S Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:50
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/06; C03B37/065; Y; Y10; Y10S; Y10S65/00; Y10S65/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1617166A
Cited
US2175225A
Cited
US2067982A
Cited
US2269459A
Cited
US2318244A
Cited
US2411660A
Cited
GB610845A
Cited
US2530345A
Cited
US2578101A
Cited
BE524749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |