US2687909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal ring
Assignee: Individual
•
Filing: 1950-09-08
•
Granted: 1954-08-31
•
Expires: 1970-09-08
Abstract
No abstract record available.
Inventors
- 👤 Glenn R Blackman
- 👤 Thad L Putnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:48
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/06; F16L; F16L23/00; F16L23/16; F16L23/18; F16L23/22; Y; Y10; Y10S; Y10S285/00; Y10S285/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US323731A
Cited
US494402A
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US783943A
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US1567813A
Cited
DE518397C
Cited
US2246600A
Cited
US2309154A
Cited
US2260542A
Cited
US2533868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |