Patent US3140266A successfully refreshed from Google Patents.
US3140266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for foaming synthetic polymers
Assignee: 3M Co
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Filing: 1960-12-30
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Granted: 1964-07-07
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Expires: 1980-12-30
Abstract
No abstract record available.
Inventors
- 👤 Warner L Peticolas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:10
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR FOAMING POLYMERS COMPRISING: EXPOSING TO A SUBSTANTIALLY INERT GAS, UNDER PRESSURE, A POLYMER HAVING A LOW TRANSMISSION RATE FOR SAID INERT GAS FOR A PERIOD OF TIME SUFFICIENT TO SUPERSATURATE THE POLYMER WITH THE GAS, THEREAFTER REDUCING THE PRESSURE OF THE INERT GAS SURROUNDING THE POLYMER, AND ESTABLISHING AT A TEMPERATURE BELOW THE SOFTENING POINT OF THE POLYMER A PRESSURE DIFFERENTIAL, BETWEEN THE INTERNAL AND EXTERNAL PRESSURES ON THE POLYMER, SUCH THAT THE INTERNAL PRESSURE IS SUFFICIENTLY HIGHER TO CAUSE THE POLYMER TO FOAM WHILE IT IS IN A SOLID STATE.
Claim 2
Dependent Claim
94 words
A PROCESS FOR FOAMING POLYMERS COMPRISING: EXPOSING TO A SUBSTANTIALLY INERT GAS, UNDER PRESSURE, A POLYMER HAVING A LOW TRANSMISSION RATE FOR SAID INERT GAS FOR A PERIOD OF TIME SUFFICIENT TO SUPERSATURATE THE POLYMER WITH THE GAS, THEREAFTER REDUCING THE PRESSURE OF THE INERT GAS SURROUNDING THE POLYMER, AND ESTABLISHING AT A TEMPERATURE BELOW THE SOFTENING POINT OF THE POLYMER A PRESSURE DIFFERENTIAL, BETWEEN THE INTERNAL AND EXTERNAL PRESSURES ON THE POLYMER, SUCH THAT THE INTERNAL PRESSURE IS SUFFICIENTLY HIGHER TO CAUSE THE POLYMER TO FOAM WHILE IT IS IN A SOLID STATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |