US3499428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smog retarder apparatus
Assignee: Individual
•
Filing: 1968-02-20
•
Granted: 1970-03-10
•
Expires: 1988-02-20
Abstract
No abstract record available.
Inventors
- 👤 Harold Tamplin Stirling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:59
CPC Classifications
F; F16; F16N; F16N39/00; F16N39/005; F01; F01N; F01N3/00; F01N3/08; F01N3/0892
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1484607A
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US1602935A
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US1591690A
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US1752050A
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US1747554A
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US2472717A
Cited
US2909284A
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US2785109A
Cited
GB888453A
Cited
US3356182A
Cited
US3392803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |