US2777255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing improved monocrystalline refractive material
Assignee: NL Industries Inc
•
Filing: 1953-02-02
•
Granted: 1957-01-15
•
Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 Merker Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:05
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/51; C04B35/01; C04B35/46; C04B35/48; C04B35/50; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/26; Y; Y10; Y10S; Y10S117/00; Y10S117/918
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2634554A
Cited
US988230A
Cited
US1004505A
Cited
US1436164A
Cited
US1298540A
Cited
GB243251A
Cited
FR662782A
Cited
CH252698A
Cited
GB608453A
Cited
US2507253A
Cited
GB664889A
Cited
US2610129A
Cited
US2628156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |