US2356553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process to lower the reflection of optically active surfaces
Assignee: Individual
•
Filing: 1940-10-24
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Granted: 1944-08-22
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Expires: 1960-10-24
Abstract
No abstract record available.
Inventors
- 👤 Weissenberg Gustav Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:42
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/213; C03C2217/23; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/116
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) | 1947-08-22 | 1948-02-21 | 1948-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-08-22 | 1952-02-21 | 1952-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-08-22 | 1956-02-21 | 1956-08-22 | $7700.00 | Window Closed / Lapsed |