Patent US2554768A successfully refreshed from Google Patents.
US2554768A
Expired / Lapsed
US
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Method of building dry seal, pistontype gas holders
Assignee: Individual
•
Filing: 1948-07-09
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Granted: 1951-05-29
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Expires: 1968-07-09
Abstract
No abstract record available.
Inventors
- 👤 John W Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:04
CPC Classifications
F; F17; F17B; F17B1/00; F17B1/02; F17B1/04; F17B1/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49828; Y10T29/49831
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) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |