Patent US3434502A successfully refreshed from Google Patents.
US3434502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible fire resistant air duct
Assignee: Individual
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Filing: 1967-05-22
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Granted: 1969-03-25
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Expires: 1987-05-22
Abstract
No abstract record available.
Inventors
- 👤 Charles D Snelling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:47
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0218; F16; F16L; F16L59/00; F16L59/02; F16L59/14; F16L59/145; F24F13/0245; F24F2221/00; F24F2221/30; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49828; Y10T29/49885; Y10T29/49888
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) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |