US2876985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valves for laboratory glassware and the like
Assignee: Fischer and Porter Co
•
Filing: 1955-06-22
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Granted: 1959-03-10
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Expires: 1975-06-22
Abstract
No abstract record available.
Inventors
- 👤 Jr George H Birchall
- 👤 James A Purdy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:06
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/06; F16K27/062
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) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |