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US3507622A
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US
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Arrangement for indicating the presence of impurities as well as contamination and poisonous substances in air and gas
Assignee: LARS ERIK TAMMELIN
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Filing: 1967-06-30
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Granted: 1970-04-21
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Expires: 1987-06-30
Abstract
No abstract record available.
Inventors
- 👤 Lars-Erik Tammelin
- 👤 Arnold Brantte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:04
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2202; G01N1/2205; G01N1/28; G01N1/40; G01N1/24; G01N2001/222; G01N2001/2223
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US676125A
Cited
US2234499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |