Patent USRE21175E successfully refreshed from Google Patents.
USRE21175E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass
Assignee: —
•
Filing: —
•
Granted: 1939-08-15
•
Expires: 1956-08-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:04
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/15; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C3/122; C03C3/127; C03C3/155; G; G02; G02B; G02B1/00; G02B1/02; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901; Y10S501/903; Y10S501/906
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) | 1942-08-14 | 1943-02-13 | 1943-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-08-14 | 1947-02-13 | 1947-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-08-14 | 1951-02-13 | 1951-08-15 | $7700.00 | Window Closed / Lapsed |