US2475810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silicon material
Assignee: AT&T Inc
•
Filing: 1944-01-05
•
Granted: 1949-07-12
•
Expires: 1964-01-05
Abstract
No abstract record available.
Inventors
- 👤 Henry C Theuerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:02
CPC Classifications
C; C22; C22B; C22B5/00; C03; C03B; C03B19/00; C03B19/02; C03B5/00; C03B5/06; C30; C30B; C30B13/00; H; H10; H10D; H10D99/00; Y; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1856851A
Cited
US830738A
Cited
US1037713A
Cited
US1572873A
Cited
US1793672A
Cited
US1738307A
Cited
US1825011A
Cited
US1769841A
Cited
US2038627A
Cited
US2079101A
Cited
US2214976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-11 | 1953-01-10 | 1953-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-11 | 1957-01-10 | 1957-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-11 | 1961-01-10 | 1961-07-12 | $7700.00 | Window Closed / Lapsed |