Patent US5535011A successfully refreshed from Google Patents.
US2988042A
Expired / Lapsed
US
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Pipe lining apparatus
Assignee: Perkins Pipe Linings Inc
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Filing: 1959-05-07
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Granted: 1961-06-13
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Expires: 1979-05-07
Abstract
No abstract record available.
Inventors
- 👤 Warren E Perkins
- 👤 Alfred J Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:50
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/04; E21D11/10; E21D11/105; B; B05; B05B; B05B13/00; B05B13/06; B05B13/0627; B05B13/0636; Y; Y10; Y10S; Y10S118/00; Y10S118/10
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) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |