Patent US3877772A successfully refreshed from Google Patents.
Patent US3416936A successfully refreshed from Google Patents.
US3416936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion resistant glass bead with sharp softening range and process for making the same
Assignee: Lukens General Industries Inc
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Filing: 1965-03-01
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Granted: 1968-12-17
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Expires: 1985-03-01
Abstract
No abstract record available.
Inventors
- 👤 Jr James D Sproul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:31
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062
Claims Analysis
Total Claims: 0
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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) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |