US3000776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming asbestos-cement pipe
Assignee: Johns Manville Corp
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Filing: 1956-10-15
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Granted: 1961-09-19
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Expires: 1976-10-15
Abstract
No abstract record available.
Inventors
- 👤 John H Swensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:48
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/42; B28B21/48; B28B21/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF FORMING ASBESTOS-CEMENT PIPE COMPRISING COLLECTING WET ASBSTOS-CEMENT STOCK ON A MANDREL, CONTACTING SAID STOCK WITH A PRESS ROLL HAVING A PERIPHERAL SURFACE OF RESILIENTLY COMPRESSIBLE MATERIAL ROUGHENED TO PROVIDE THEREIN A MULTIPLICITY OF LANDS AND CORRESPONDING VALLEYS, APPLYING PRESSURE RESILIENTLY THROUGH SAID PRESS ROLL AND SAID MULTIPLICITY OF LANDS ON THE PERIPHERAL SURFACE THEREOF TO CONDENSE THE STOCK ON THE MANDREL, THE PRESSURE SO APPLIED TO SAID STOCK BEING AT LEAST ABOUT 300 LBS. PER FOOT OF PIPE LENGTH.
Claim 2
Independent Claim
82 words
A METHOD OF FORMING ASBESTOS-CEMENT PIPE COMPRISING COLLECTING WET ASBSTOS-CEMENT STOCK ON A MANDREL, CONTACTING SAID STOCK WITH A PRESS ROLL HAVING A PERIPHERAL SURFACE OF RESILIENTLY COMPRESSIBLE MATERIAL ROUGHENED TO PROVIDE THEREIN A MULTIPLICITY OF LANDS AND CORRESPONDING VALLEYS, APPLYING PRESSURE RESILIENTLY THROUGH SAID PRESS ROLL AND SAID MULTIPLICITY OF LANDS ON THE PERIPHERAL SURFACE THEREOF TO CONDENSE THE STOCK ON THE MANDREL, THE PRESSURE SO APPLIED TO SAID STOCK BEING AT LEAST ABOUT 300 LBS. PER FOOT OF PIPE LENGTH.
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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |