US3528546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water sensitive flow monitor
Assignee: Velcon Filters Inc
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Filing: 1968-09-11
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Granted: 1970-09-15
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Expires: 1988-09-11
Abstract
No abstract record available.
Inventors
- 👤 Robert W Mcpherson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
G; G01; G01N; G01N19/00; G01N19/10; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; G01N33/00; G01N33/26; G01N33/28; G01N33/2835; G01N33/2847
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) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |