Patent US1538902A successfully refreshed from Google Patents.
US1538902A
Expired / Lapsed
US
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Core and method of making conduits
Assignee: Individual
•
Filing: 1923-04-20
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Granted: 1925-05-26
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Expires: 1943-04-20
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:46
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/28; B28B7/30; Y; Y10; Y10S; Y10S249/00; Y10S249/02
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) | 1928-05-25 | 1928-11-24 | 1929-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-05-25 | 1932-11-24 | 1933-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-05-25 | 1936-11-24 | 1937-05-26 | $7700.00 | Window Closed / Lapsed |