US2706253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective wave length filter spectrophotometer
Assignee: Phillips Petroleum Co
•
Filing: 1951-01-30
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Granted: 1955-04-12
•
Expires: 1971-01-30
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Hutchins
- 👤 Crawford F Weldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:53
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2286985A
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US2269674A
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US2395489A
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US2412940A
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US2437323A
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US2503165A
Cited
US2621298A
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US2483746A
Cited
US2525445A
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US2613572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-11 | 1958-10-11 | 1959-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-11 | 1962-10-11 | 1963-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-11 | 1966-10-11 | 1967-04-12 | $7700.00 | Window Closed / Lapsed |