Patent US2880497A successfully refreshed from Google Patents.
Patent US2895505A successfully refreshed from Google Patents.
US2895505A
Expired / Lapsed
US
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Pressure valve and control system for paper pulp machines
Assignee: AT&T Inc
•
Filing: 1954-08-31
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Granted: 1959-07-21
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Expires: 1974-08-31
Abstract
No abstract record available.
Inventors
- 👤 Benson F Bachus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:21
CPC Classifications
D; D21; D21F; D21F1/00; F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85954
Claims Analysis
Total Claims: 0
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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) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |