Patent GB520778A successfully refreshed from Google Patents.
US2951721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite seal
Assignee: Halogen Insulator and Seal Corp
•
Filing: 1956-02-23
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Granted: 1960-09-06
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Expires: 1976-02-23
Abstract
No abstract record available.
Inventors
- 👤 Howard L Asp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:40
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3284; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10S277/945; Y10S277/946; Y10S285/00; Y10S285/909; Y10T; Y10T428/00; Y10T428/21; Y10T428/215; Y10T428/249921; Y10T428/249994; Y10T428/249999; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1095810A
Cited
US1705445A
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US2459720A
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US2485691A
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US2689380A
Cited
US2728698A
Cited
US2833686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |