Patent US1838781A successfully refreshed from Google Patents.
US1838781A
Expired / Lapsed
US
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Glass treatment
Assignee: American Optical Corp
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Filing: 1930-03-17
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Granted: 1931-12-29
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Expires: 1950-03-17
Abstract
No abstract record available.
Inventors
- 👤 Harold R Moulton
- 👤 Edgar D Tillyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:38
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/203; C03C; C03C17/00; C03C17/06; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/263; C03C2218/00; C03C2218/10; C03C2218/17; Y; Y10; Y10T; Y10T428/00; Y10T428/21
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) | 1934-12-28 | 1935-06-29 | 1935-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-12-28 | 1939-06-29 | 1939-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-12-28 | 1943-06-29 | 1943-12-29 | $7700.00 | Window Closed / Lapsed |