US2938525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1957-06-07
•
Granted: 1960-05-31
•
Expires: 1977-06-07
Abstract
No abstract record available.
Inventors
- 👤 James W Mackinlay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:07
CPC Classifications
E; E04; E04H; E04H15/00; E04H15/02; E04H15/06; Y; Y10; Y10S; Y10S135/00; Y10S135/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1483741A
Cited
US969899A
Cited
US1285766A
Cited
US2533683A
Cited
US2825351A
Cited
FR1136405A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |