US3328588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the efficacy of an air filter
Assignee: Individual
•
Filing: 1963-12-10
•
Granted: 1967-06-27
•
Expires: 1983-12-10
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Steinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:53
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/85; G01N15/00; G01N15/08; G01N15/082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
APPARATUS FOR MEASURING THE EFFICACY OF AN AIR FILTER, COMPRISING, STRUCTURE DEFINING A PAIR OF CHAMBERS EACH HAVING AN OPENING COMMUNICATING ONE WITH THE OTHER, ONE CHAMBER OF SAID PAIR OF CHAMBERS BEING SLIDABLY MOUNTED WITH RESPECT TO THE OTHER OF SAID PAIR OF CHAMBERS, WITH SAID AIR FILTER BEING POSITIONED BETWEEN SAID OPENING IN EACH SAID CHAMBERS, A SMOKE GENERATOR
Claim 2
Dependent Claim
61 words
APPARATUS FOR MEASURING THE EFFICACY OF AN AIR FILTER, COMPRISING, STRUCTURE DEFINING A PAIR OF CHAMBERS EACH HAVING AN OPENING COMMUNICATING ONE WITH THE OTHER, ONE CHAMBER OF SAID PAIR OF CHAMBERS BEING SLIDABLY MOUNTED WITH RESPECT TO THE OTHER OF SAID PAIR OF CHAMBERS, WITH SAID AIR FILTER BEING POSITIONED BETWEEN SAID OPENING IN EACH SAID CHAMBERS, A SMOKE GENERATOR
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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |