US3481509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mass flow controller
Assignee: Procter and Gamble Co
•
Filing: 1967-10-18
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Granted: 1969-12-02
•
Expires: 1987-10-18
Abstract
No abstract record available.
Inventors
- 👤 Hans H Marhauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:51
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/76; G01F1/78; G05; G05D; G05D7/00; G05D7/06; G05D7/0617; G05D7/0623
Claims Analysis
Total Claims: 0
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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) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |