Patent US1740752A successfully refreshed from Google Patents.
US1740752A
Expired / Lapsed
US
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Treating lead alloys
Assignee: NL Industries Inc
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Filing: 1924-08-12
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Granted: 1929-12-24
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Expires: 1944-08-12
Abstract
No abstract record available.
Inventors
- 👤 Gustave W Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:25
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; C; C22; C22B; C22B13/00; C22B13/06; B01J2219/00; B01J2219/00049; B01J2219/00051
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) | 1932-12-23 | 1933-06-24 | 1933-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-12-23 | 1937-06-24 | 1937-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-12-23 | 1941-06-24 | 1941-12-24 | $7700.00 | Window Closed / Lapsed |