Patent US2814513A successfully refreshed from Google Patents.
Patent US2621049A successfully refreshed from Google Patents.
US2621049A
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Reversing valve and control means therefor
Assignee: Blaw Knox Co
•
Filing: 1946-04-12
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Granted: 1952-12-09
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Expires: 1966-04-12
Abstract
No abstract record available.
Inventors
- 👤 Edward W Pottmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:47
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/235; C03B5/237; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y10; Y10T; Y10T137/00; Y10T137/5544; Y10T137/5689; Y10T137/8593; Y10T137/87571; Y10T137/87676; Y10T137/87684; Y10T137/877; Y10T137/87708; Y10T137/87772
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |