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US2869694A
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Frame construction for filter units
Assignee: Air Filter Corp
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Filing: 1957-06-19
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Granted: 1959-01-20
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Expires: 1977-06-19
Abstract
No abstract record available.
Inventors
- 👤 Raymond J Breckheimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:00
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/52; B; B01; B01D; B01D46/00; B01D46/10; E04; E04B; E04B1/00; E04B1/38; E04B1/58; E04B1/5825; E04B1/5831; F; F16; F16B; F16B17/00; F16B5/00; F16B5/06; F24; F24F; F24F13/00; F24F13/28; E04B1/18; E04B1/24; E04B1/2403; E04B2001/2406; E04B2001/5856; E04B2001/5881; F16B2200/00; F16B2200/67; Y; Y10; Y10S; Y10S55/00; Y10S55/31; Y10T; Y10T403/00; Y10T403/46; Y10T403/4602
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) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |