This is a continuation-in-part of our co-pending U.S. patent application Ser. No. 519,220, filed Oct. 30, 1974.
Number | Name | Date | Kind |
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3037496 | Melges | Jun 1962 | |
3406015 | Foster | Oct 1968 | |
3406016 | Foster et al. | Oct 1968 | |
3472738 | Foster | Oct 1969 | |
3842166 | Bucalo | Oct 1974 |
Entry |
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Michael, R. P. et al., Science, May 28, 1971, vol. 172, pp. 964-966. |
J.A.M.A., vol. 186, No. 5, Nov. 1963, pp. 19 & 20. |
Marshall, J. R., Proceedings of a Research Conf., on Nat. Family Planning, Jan. 23-26, 1972, pp. 135-143. |
Number | Date | Country | |
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Parent | 519220 | Oct 1974 |