Patent US2727293A successfully refreshed from Google Patents.
US2727293A
Expired / Lapsed
US
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Method of and apparatus for producing prestressed reinforced hardened plastic bodies
Assignee: Fulbright Crooker Freeman and Bates
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Filing: 1952-10-16
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Granted: 1955-12-20
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Expires: 1972-10-16
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Barnett
- 👤 Maurice N Sumner
- 👤 John E Cashman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:28
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/20; E04C3/26; E04C5/00; E04C5/08; E04G; E04G21/00; E04G21/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
IN THE METHOD OF STRESSING A HARDENED PLASTIC BODY HAVING AT LEAST ONE REINFORCING MEMBER EMBEDDED THEREIN, THE IMPROVEMENT COMPRISING MAINTAINING SELECTED PORTIONS ONLY OF THE REINFORCING MEMBER AT A TEMPERATURE DIFFERENT FROM THAT OF THE PLASTIC BODY AS THE BODY HARDENS AND DISCONTINUING THE MAINTENANCE OF SAID SELECTED PORTIONS AT A TEMPERATURE DIFFERENT FROM THAT OF THE PLASTIC BODY AFTER THE BODY HAS HARDENED AND THE REINFORCING MEMBER HAS BEEN BONDED TO THE BODY.
Claim 2
Dependent Claim
75 words
IN THE METHOD OF STRESSING A HARDENED PLASTIC BODY HAVING AT LEAST ONE REINFORCING MEMBER EMBEDDED THEREIN, THE IMPROVEMENT COMPRISING MAINTAINING SELECTED PORTIONS ONLY OF THE REINFORCING MEMBER AT A TEMPERATURE DIFFERENT FROM THAT OF THE PLASTIC BODY AS THE BODY HARDENS AND DISCONTINUING THE MAINTENANCE OF SAID SELECTED PORTIONS AT A TEMPERATURE DIFFERENT FROM THAT OF THE PLASTIC BODY AFTER THE BODY HAS HARDENED AND THE REINFORCING MEMBER HAS BEEN BONDED TO THE BODY.
Claim 3
Dependent Claim
41 words
IN THE METHOD OF PRESTRESSING A HARDENED PLASTIC BODY HAVING AT LEAST ONE REINFORCING MEMBER IN IT, THE IMPROVEMENT OF MAINTAINING SELECTED PORTIONS OF THE REINFORCING MEMBER AT A TEMPERATURE LOWER THAN THAT OF THE PLASTIC BODY AS THE BODY HARDENS.
Claim 4
Dependent Claim
41 words
IN THE METHOD OF PRESTRESSING A HARDENED PLASTIC BODY HAVING AT LEAST ONE REINFORCING MEMBER IN IT, THE IMPROVEMENT OF MAINTAINING SELECTED PORTIONS OF THE REINFORCING MEMBER AT A TEMPERATURE LOWER THAN THAT OF THE PLASTIC BODY AS THE BODY HARDENS.
References Cited (Backward Citations)
US2319105A
Cited
US2413990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |