US2844255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination filter and surface skimmer
Assignee: Landon Inc
•
Filing: 1956-04-06
•
Granted: 1958-07-22
•
Expires: 1976-04-06
Abstract
No abstract record available.
Inventors
- 👤 David K Cavenah
- 👤 Paul J Steffen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:29
CPC Classifications
E; E03; E03B; E03B7/00; E03B7/07; E03B7/074; B; B01; B01D; B01D29/00; B01D29/39; B01D29/41; E02; E02B; E02B15/00; E02B15/04; E02B15/10; E02B15/106; E04; E04H; E04H4/00; E04H4/12; E04H4/1209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB557393A
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US2507126A
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US2617764A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |