US2804936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust filters
Assignee: Individual
•
Filing: 1954-08-18
•
Granted: 1957-09-03
•
Expires: 1974-08-18
Abstract
No abstract record available.
Inventors
- 👤 Gerhard K E H Stampe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:07
CPC Classifications
A; A62; A62B; A62B23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A DUST FILTER COMPRISING A CANISTER, A FILTER FILLING IN SAID CANISTER COMPOSED OF PARTICLES OF HYDROPHOBIC SYNTHETIC MATERIAL, EACH PARTICLE HAVING A VOLUME OF ABOUT ONE CUBIC MILLIMETER, AND MEANS FOR HOLDING SAID MATERIAL IN SAID CANISTER.
Claim 2
Dependent Claim
38 words
A DUST FILTER COMPRISING A CANISTER, A FILTER FILLING IN SAID CANISTER COMPOSED OF PARTICLES OF HYDROPHOBIC SYNTHETIC MATERIAL, EACH PARTICLE HAVING A VOLUME OF ABOUT ONE CUBIC MILLIMETER, AND MEANS FOR HOLDING SAID MATERIAL IN SAID CANISTER.
References Cited (Backward Citations)
US1847297A
Cited
US1963874A
Cited
US2195565A
Cited
US2411660A
Cited
US2442356A
Cited
US2689199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |