US1521603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat gasket and process of making same
Assignee: Johns Manville Inc
•
Filing: 1922-12-19
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Granted: 1925-01-06
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Expires: 1942-12-19
Abstract
No abstract record available.
Inventors
- 👤 Witt Walter M De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:19
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/108; Y; Y10; Y10S; Y10S277/00; Y10S277/922; Y10T; Y10T156/00; Y10T156/16
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) | 1928-01-06 | 1928-07-07 | 1929-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-01-06 | 1932-07-07 | 1933-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-01-06 | 1936-07-07 | 1937-01-06 | $7700.00 | Window Closed / Lapsed |