US2636637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chamber closure
Assignee: NL Industries Inc
•
Filing: 1949-02-08
•
Granted: 1953-04-28
•
Expires: 1969-02-08
Abstract
No abstract record available.
Inventors
- 👤 Dixon D Powers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:24
CPC Classifications
F; F16; F16J; F16J13/00; F16J13/02; F16J13/10; Y; Y10; Y10T; Y10T292/00; Y10T292/20; Y10T292/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1371594A
Cited
US1366496A
Cited
US2237029A
Cited
US2342186A
Cited
US2203364A
Cited
US2226495A
Cited
US2223320A
Cited
US2401856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |