US2679933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for separating airborne asbestos material
Assignee: Individual
•
Filing: 1950-04-24
•
Granted: 1954-06-01
•
Expires: 1970-04-24
Abstract
No abstract record available.
Inventors
- 👤 Nathan J Lockhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:47
CPC Classifications
B; B07; B07B; B07B9/00; B07B9/02; B07B7/00; B07B7/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US241513A
Cited
US247694A
Cited
US247946A
Cited
US393411A
Cited
US485571A
Cited
US1310917A
Cited
US21945A
Cited
USRE15275E
Cited
US1074040A
Cited
US1244788A
Cited
US1418735A
Cited
US1427117A
Cited
US1380322A
Cited
US1434843A
Cited
US1768619A
Cited
US1741869A
Cited
US1684365A
Cited
CH112997A
Cited
DE533414C
Cited
AT138040B
Cited
US1934180A
Cited
DE614663C
Cited
GB425271A
Cited
US2162396A
Cited
US2221385A
Cited
US2546286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |