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US2239263A
Expired / Lapsed
US
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Examination of transparent solid materials
Assignee: Pilkington Automotive Ltd
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Filing: 1939-01-10
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Granted: 1941-04-22
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Expires: 1959-01-10
Abstract
No abstract record available.
Inventors
- 👤 Waine Allan Coley
- 👤 Din Fazul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:19
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/55
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) | 1944-04-21 | 1944-10-21 | 1945-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-21 | 1948-10-21 | 1949-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-21 | 1952-10-21 | 1953-04-22 | $7700.00 | Window Closed / Lapsed |