Patent US3135652A successfully refreshed from Google Patents.
US3135652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level control for a pressurized headbox of a paper-making machine
Assignee: Sandy Hill Iron and Brass Works
•
Filing: 1962-08-17
•
Granted: 1964-06-02
•
Expires: 1982-08-17
Abstract
No abstract record available.
Inventors
- 👤 Robert E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:00
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |