Patent US2227082A successfully refreshed from Google Patents.
US2227082A
Expired / Lapsed
US
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Phosphate glass
Assignee: WALTER H DUISBERG
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Filing: 1938-06-14
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Granted: 1940-12-31
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Expires: 1958-06-14
Abstract
No abstract record available.
Inventors
- 👤 Grimm Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/335; C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/19; Y; Y10; Y10S; Y10S501/00; Y10S501/90
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) | 1943-12-31 | 1944-07-01 | 1944-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-12-31 | 1948-07-01 | 1948-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-12-31 | 1952-07-01 | 1952-12-31 | $7700.00 | Window Closed / Lapsed |