US1245688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for testing gases.
Assignee: Roessler and Hasslacher Chemical Co
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Filing: 1916-07-03
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Granted: 1917-11-06
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Expires: 1936-07-03
Abstract
No abstract record available.
Inventors
- 👤 George G Crewson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/20; G01N25/22; G01N25/40; G01N25/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1920-11-05 | 1921-05-07 | 1921-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-11-05 | 1925-05-07 | 1925-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-11-05 | 1929-05-07 | 1929-11-06 | $7700.00 | Window Closed / Lapsed |